chore(env): update Flutter and SDK constraints for compatibility

- Downgraded Flutter version in .fvmrc from 3.29.3 to 3.27.0 for compatibility with current dependencies
- Raised Dart SDK constraint in benchmark_di/pubspec.yaml from >=3.0.0 <4.0.0 to >=3.2.0 <4.0.0 to align with required package minimums

This change ensures environment compatibility for dependency resolution and build tools. No functional code changes.

cherrypick_generator/analysis_options.yaml

@@ -31,4 +31,5 @@ include: package:lints/recommended.yaml
 
 analyzer:
   errors:
-    deprecated_member_use: ignore
+    deprecated_member_use: ignore
+    unintended_html_in_doc_comment: ignore

cherrypick_generator/pubspec.yaml

@@ -15,7 +15,7 @@ topics:
   - inversion-of-control
 
 environment:
-  sdk: ">=3.5.2 <4.0.0"
+  sdk: ">=3.6.0 <4.0.0"
 
 # Add regular dependencies here.
 dependencies:
@@ -27,7 +27,7 @@ dependencies:
   collection: ^1.18.0
 
 dev_dependencies:
-  lints: ^4.0.0
+  lints: ^5.1.1
   mockito: ^5.4.4
   test: ^1.25.8
   build_test: ^2.1.7