Update CI

Author: minad

.github/workflows/test.yml

@@ -17,7 +17,7 @@ jobs:
           - 'release-snapshot'
           - 'snapshot'
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: purcell/setup-emacs@master
         with:
           version: ${{ matrix.emacs-version }}