GitHub CI: update checkout and setup-python actions to v7

v3/v4 use a deprecated Node version.

Author: greenrobot

.github/workflows/test.yaml

@@ -17,10 +17,10 @@ jobs:
     runs-on: ${{ matrix.os }}-latest
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v7
 
       - name: Set up Python ${{ matrix.python }}
-        uses: actions/setup-python@v4
+        uses: actions/setup-python@v7
         with:
           python-version: ${{ matrix.python }}
           cache: 'pip'