Fix escaping of braces in pre-commit hash step

.github/workflows/linting.yml

@@ -17,7 +17,7 @@ jobs:
         uses: actions/cache@v4
         with:
           path: ~/.cache/pre-commit
-          key: pre-commit-${{ '{{' }} hashFiles('.pre-commit-config.yaml') {{ '}}' }}
+          key: pre-commit-${{ hashFiles('.pre-commit-config.yaml') }}
 
       - name: Set up Python
         uses: actions/setup-python@v5