Change filter regex exclude

Author: holtskinner

.github/workflows/linter.yaml

@@ -64,5 +64,5 @@ jobs:
           VALIDATE_GIT_COMMITLINT: false
           PYTHON_MYPY_CONFIG_FILE: .mypy.ini
           FILTER_REGEX_INCLUDE: ".*src/**/*"
-          FILTER_REGEX_EXCLUDE: "**/grpc/**/*"
+          FILTER_REGEX_EXCLUDE: ".*src/a2a/grpc/**/*"
           PYTHON_RUFF_CONFIG_FILE: .ruff.toml