ci: Switch autoclose actions to SHA hashes

Author: QuLogic

.github/workflows/autoclose_schedule.yml

@@ -22,15 +22,15 @@ jobs:
     name: autoclose labeled PRs
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6.0.2
-      - uses: actions/setup-python@v6.2.0
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
+      - uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405  # v6.2.0
         with:
           python-version: '3.13'
       - name: Install PyGithub
         run: pip install -Uq PyGithub
 
       - name: Checkout repository
-        uses: actions/checkout@v6.0.2
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
 
       - name: Close PRs labeled more than 14 days ago
         run: |