fix(ruff): add missing Set and Dict imports (F821) (#21785)

* fix(ruff): add missing Set and Dict imports to fix F821 errors

* fix(ci): add semantic_router dep to guardrails_testing job

The test_build_routes_combined_templates test calls build_routes() which
imports from semantic_router, but the guardrails_testing CI job didn't
install it.

.circleci/config.yml

@@ -1456,6 +1456,7 @@ jobs:
             pip install "respx==0.22.0"
             pip install "pydantic==2.10.2"
             pip install "boto3==1.36.0"
+            pip install "semantic_router==0.1.10"
       # Run pytest and generate JUnit XML report
       - run:
           name: Run tests