Update ci.yaml

Author: mosfet80

.github/workflows/ci.yaml

@@ -35,7 +35,7 @@ jobs:
     name: ${{ matrix.env.IMAGE }}
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - name: cache upstream_ws