Remove dependency overrides.

Author: davidmorgan

source_gen/pubspec.yaml

@@ -22,35 +22,8 @@ dependencies:
 dev_dependencies:
   _test_annotations:
     path: ../_test_annotations
-  build_test: ^3.0.0
+  build_test: ^3.1.1
   dart_flutter_team_lints: ^3.1.0
   logging: ^1.0.0
   term_glyph: ^1.2.0
   test: ^1.16.0
-
-dependency_overrides:
-  build:
-    git:
-      url: https://github.com/dart-lang/build
-      path: build
-      ref: cb75ab58d375bd14e8beff8167ff67a4da456ff7
-  build_resolvers:
-    git:
-      url: https://github.com/dart-lang/build
-      path: build_resolvers
-      ref: cb75ab58d375bd14e8beff8167ff67a4da456ff7
-  build_runner:
-    git:
-      url: https://github.com/dart-lang/build
-      path: build_runner
-      ref: cb75ab58d375bd14e8beff8167ff67a4da456ff7
-  build_runner_core:
-    git:
-      url: https://github.com/dart-lang/build
-      path: build_runner_core
-      ref: cb75ab58d375bd14e8beff8167ff67a4da456ff7
-  build_test:
-    git:
-      url: https://github.com/dart-lang/build
-      path: build_test
-      ref: cb75ab58d375bd14e8beff8167ff67a4da456ff7