fix: Apply Ruff formatting to manifest validation test file

- Remove trailing whitespace on line 300
- Resolves Ruff Format Check CI failure

Co-Authored-By: AJ Steers <[email protected]>

Author: devin-ai-integration[bot]

unit_tests/sources/declarative/test_manifest_registry_validation.py

@@ -297,7 +297,7 @@ def test_manifest_validates_against_schema(
     is_ci = os.getenv("CI") == "true" or os.getenv("GITHUB_ACTIONS") == "true"
     if SKIP_COMPREHENSIVE_VALIDATION_IN_CI and is_ci:
         pytest.skip("Skipping comprehensive validation in CI to avoid timeouts")
-    
+
     # Download manifest first to get CDK version
     try:
         manifest_content, cdk_version = download_manifest(connector_name, download_failures)