tool: fix melos in CI

melos.yaml

@@ -3,6 +3,12 @@ repository: https://github.com/provokateurin/nextcloud-neon
 
 sdkPath: .fvm/flutter_sdk
 
+bootstrap:
+  # It seems so that running "pub get" in parallel has some issues (like
+  # https://github.com/dart-lang/pub/issues/3404). Disabling this feature
+  # makes the CI much more stable.
+  runPubGetInParallel: false
+
 packages:
   - packages/*
   - packages/dynamite/*