refactor(dynamite,neon,nextcloud): use dart 3.1 utf8.encode as Uint8List

While the entire utf8 converter has been switched to Uint8List the type annotation still remains List<int> for this release.
Adding the downcast as this behavior is what we need.

A future dart release should also change the type annotations triggering a linter rule.
see: https://github.com/dart-lang/sdk/issues/52801
Signed-off-by: Nikolas Rimikis <rimikis.nikolas@gmail.com>

packages/dynamite/dynamite/lib/src/openapi_builder.dart

@@ -541,7 +541,7 @@ class OpenAPIBuilder implements Builder {
                                       code.write('if ($parameterName != null) {');
                                     }
                                     code.write(
-                                      '_body = Uint8List.fromList(utf8.encode(${result.encode(parameterName, mimeType: mimeType)}));',
+                                      '_body = utf8.encode(${result.encode(parameterName, mimeType: mimeType)}) as Uint8List;',
                                     );
                                     if (dartParameterNullable) {
                                       code.write('}');

packages/neon/neon/lib/src/pages/settings.dart

@@ -260,7 +260,7 @@ class _SettingsPageState extends State<SettingsPage> {
                             ),
                           ),
                         );
-                        await saveFileWithPickDialog(fileName, Uint8List.fromList(utf8.encode(data)));
+                        await saveFileWithPickDialog(fileName, utf8.encode(data) as Uint8List);
                       } catch (e, s) {
                         debugPrint(e.toString());
                         debugPrint(s.toString());

packages/nextcloud/lib/src/api/notes.openapi.dart

@@ -336,9 +336,8 @@ class NotesClient extends DynamiteClient {
     }
     // coverage:ignore-end
     headers['Content-Type'] = 'application/json';
-    body = Uint8List.fromList(
-      utf8.encode(json.encode(_jsonSerializers.serialize(settings, specifiedType: const FullType(NotesSettings)))),
-    );
+    body = utf8.encode(json.encode(_jsonSerializers.serialize(settings, specifiedType: const FullType(NotesSettings))))
+        as Uint8List;
     final response = await doRequest(
       'put',
       Uri(path: path, queryParameters: queryParameters.isNotEmpty ? queryParameters : null).toString(),

packages/nextcloud/lib/src/webdav/client.dart

@@ -247,13 +247,11 @@ class WebDavClient {
           'PROPFIND',
           _constructPath(path),
           data: Stream.value(
-            Uint8List.fromList(
             utf8.encode(
               WebDavPropfind(prop: prop ?? WebDavPropWithoutValues())
                   .toXmlElement(namespaces: namespaces)
                   .toXmlString(),
-              ),
-            ),
+            ) as Uint8List,
           ),
           headers: {
             if (depth != null) ...{
@@ -277,14 +275,12 @@ class WebDavClient {
           'REPORT',
           _constructPath(path),
           data: Stream.value(
-            Uint8List.fromList(
             utf8.encode(
               WebDavOcFilterFiles(
                 filterRules: filterRules,
                 prop: prop ?? WebDavPropWithoutValues(), // coverage:ignore-line
               ).toXmlElement(namespaces: namespaces).toXmlString(),
-              ),
-            ),
+            ) as Uint8List,
           ),
         ),
       );
@@ -304,14 +300,12 @@ class WebDavClient {
       'PROPPATCH',
       _constructPath(path),
       data: Stream.value(
-        Uint8List.fromList(
         utf8.encode(
           WebDavPropertyupdate(
             set: set != null ? WebDavSet(prop: set) : null,
             remove: remove != null ? WebDavRemove(prop: remove) : null,
           ).toXmlElement(namespaces: namespaces).toXmlString(),
-          ),
-        ),
+        ) as Uint8List,
       ),
     );
     final data = await _parseResponse(response);

packages/nextcloud/test/webdav_test.dart

@@ -137,7 +137,7 @@ void main() {
     });
 
     test('Get directory props', () async {
-      final data = Uint8List.fromList(utf8.encode('test'));
+      final data = utf8.encode('test') as Uint8List;
       await client.webdav.mkcol('test');
       await client.webdav.put(data, 'test/test.txt');
 
@@ -169,7 +169,7 @@ void main() {
     });
 
     test('Filter files', () async {
-      final response = await client.webdav.put(Uint8List.fromList(utf8.encode('test')), 'test.txt');
+      final response = await client.webdav.put(utf8.encode('test') as Uint8List, 'test.txt');
       final id = response.headers['oc-fileid']!.first;
       await client.webdav.proppatch(
         'test.txt',
@@ -202,7 +202,7 @@ void main() {
       final uploadTime = DateTime.now();
 
       await client.webdav.put(
-        Uint8List.fromList(utf8.encode('test')),
+        utf8.encode('test') as Uint8List,
         'test.txt',
         lastModified: lastModifiedDate,
         created: createdDate,
@@ -237,7 +237,7 @@ void main() {
     });
 
     test('Remove properties', () async {
-      await client.webdav.put(Uint8List.fromList(utf8.encode('test')), 'test.txt');
+      await client.webdav.put(utf8.encode('test') as Uint8List, 'test.txt');
 
       var updated = await client.webdav.proppatch(
         'test.txt',
@@ -323,7 +323,7 @@ void main() {
           ('put_get_utf8_segment', 'res-%e2%82%ac'),
         ]) {
           test(name, () async {
-            final content = Uint8List.fromList(utf8.encode('This is a test file'));
+            final content = utf8.encode('This is a test file') as Uint8List;
 
             final response = await client.webdav.put(content, path);
             expect(response.statusCode, 201);