Re-add @rev to workflow actions

Author: JaapJoris

.github/workflows/main.yml

@@ -9,8 +9,8 @@ jobs:
     name: Run pre-commit hooks
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout
-      - uses: actions/setup-python
+      - uses: actions/checkout@main
+      - uses: actions/setup-python@main
       - run: python -m pip install --upgrade pre-commit
       - run: pre-commit run -a
 
@@ -26,8 +26,8 @@ jobs:
         - '3.12'
         - '3.13'
     steps:
-      - uses: actions/checkout
-      - uses: actions/setup-python
+      - uses: actions/checkout@main
+      - uses: actions/setup-python@main
         with:
           python-version: ${{ matrix.python-version }}
       - run: python -m pip install --upgrade nox