fix: adjust version for lint

Makefile

 format:
-	uv run black --target-version py313 -l 88 .
+	uv run black --target-version py311 -l 88 .
 	uv run ruff --select I --fix .
 
 PYTHON_FILES=.
@@ -7,7 +7,7 @@ lint: PYTHON_FILES=.
 lint_diff: PYTHON_FILES=$(shell git diff --name-only --diff-filter=d main | grep -E '\.py$$')
 
 lint lint_diff:
-	uv run black --target-version py313 -l 88 $(PYTHON_FILES) --check
+	uv run black --target-version py311 -l 88 $(PYTHON_FILES) --check
 	uv run ruff check .
 	uv run mypy $(PYTHON_FILES)