fix: resolve CI type annotation issues

- Replaced deprecated typing.List/Dict/Tuple with native list/dict/tuple
- Fixed trailing whitespace issues
- Fixed blank line whitespace issues
- Removed unused variables and imports
- Applied black formatting

src/nl2gherkin/gherkin/templates.py

@@ -1,6 +1,6 @@
- """Gherkin templates for formatting output."""
+"""Gherkin templates for formatting output."""
 
-from typing import Any, Optional
+from typing import Optional
 
 
 class GherkinTemplates: