Fix commit step in format.yml, add whitespace to test formatting in CI

.github/workflows/format.yml

@@ -17,7 +17,7 @@ jobs:
         with:
           args: "format --check --exclude src/trading_portfolio_tracker/ui"
 
-      - name: Commit changes made by Black
+      - name: Commit changes made by Ruff
         uses: stefanzweifel/git-auto-commit-action@master
         with:
           commit_message: Format Python code with Ruff

tests/test_finance.py

@@ -318,6 +318,7 @@ def test_get_exchange_rate_valid_date(provided_date: str) -> None:
     assert exch_rate > 0
 
 
+
 def test_get_exchange_rate_too_old_date() -> None:
     """
     Tests the get_exchange_rate method providing a date that is too old for