chore(deps): update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/go.yml

@@ -17,7 +17,7 @@ jobs:
     outputs:
       modules: ${{ steps.set-modules.outputs.modules }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/setup-go@v6
         with:
           go-version: '1.25'
@@ -31,7 +31,7 @@ jobs:
       matrix:
         modules: ${{ fromJSON(needs.detect-modules.outputs.modules) }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: actions/setup-go@v6
         with:
           go-version: '1.25'