Update GitHub Actions to use latest versions

Author: cclauss

.github/workflows/build.yml

@@ -10,10 +10,10 @@ jobs:
   build:
     runs-on: macos-latest
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+      - uses: actions/checkout@v5
+      - uses: actions/setup-python@v6
         with:
-          python-version: "3.10"  # Should be 3.13
+          python-version: "3.x"
           allow-prereleases: true
       - run: pip install --upgrade pip
       - run: sudo xcode-select -switch /Applications/Xcode.app/Contents/Developer