fix ci action versions

Author: facundoolano

.github/workflows/tests.yml

@@ -10,11 +10,11 @@ jobs:
   checks:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v7
       - name: Check README is updated
         run: ./gen_readme.py | diff README.md -
       - name: Set up Python
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v7
         with:
           python-version: 3.9
       - name: Install dependencies