Update linters.yml

.github/workflows/linters.yml

@@ -5,7 +5,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v1
-      - name: Set up Python 3.9.20
+      - name: Set up Python 3.9.21
         uses: actions/setup-python@v1
         with:
           python-version: 3.9.20