Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/e2e.yaml

@@ -17,7 +17,7 @@ jobs:
       ARTIFACTS: ${{github.workspace}}/artifacts
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: actions/setup-go@v6
       with:
         go-version-file: go.mod

.github/workflows/release.yaml

@@ -20,7 +20,7 @@ jobs:
     steps:
     - if: ${{ !startsWith(github.ref, 'refs/tags/v') }}
       run: echo "flags=--snapshot" >> $GITHUB_ENV
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         fetch-depth: 0
     - uses: actions/setup-go@v6

.github/workflows/verify.yaml

@@ -12,7 +12,7 @@ jobs:
   verify:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - uses: actions/setup-go@v6
       with:
         go-version-file: go.mod