Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/golangci-lint.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out code into the Go module directory
-        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6
       - name: golangci-lint
         uses: reviewdog/action-golangci-lint@v2
         with:

.github/workflows/test.yml

@@ -11,5 +11,5 @@ jobs:
       - uses: actions/setup-go@v6
         with:
           go-version: ${{ matrix.go-version }}
-      - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6
       - run: go test ./...