Bump dart_style to 3.0.0

* Also bump the analyzer version used to validate generation.
* Also regenerate web
* Also regenerate renderers

Author: srawlins

.github/workflows/test.yaml

@@ -22,9 +22,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        # TODO(srawlins): Re-enable stable when stable works with analyzer 6.9.0
-        # (Dart 3.6.0).
-        sdk: [dev]
+        sdk: [stable, dev]
         job: [main, flutter, packages, sdk-docs]
         include:
           - os: macos-latest