Upgrade GitHub Actions

* https://github.com/actions/checkout/releases is v6.0.2
* https://github.com/actions/setup-python/releases is v6.2.0

Author: cclauss

.github/workflows/python-package.yml

@@ -49,7 +49,7 @@ jobs:
             python-version: "pypy-3.11"
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v6
         with:
           submodules: true
       - uses: actions/setup-python@v6
@@ -70,10 +70,10 @@ jobs:
   type-check:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           submodules: true
-      - uses: actions/setup-python@v5
+      - uses: actions/setup-python@6
         with:
           python-version: "3.10"
       - name: Install requirements