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

Author: renovate[bot]

.github/workflows/build.yml

@@ -14,7 +14,7 @@ jobs:
       matrix:
         go: [ '1.22', '1.23' ]
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - uses: actions/setup-go@v5
       with:
         go-version: ${{ matrix.go }}

.github/workflows/renovate.yml

@@ -13,7 +13,7 @@ jobs:
     if: (github.event_name == 'push' || github.event.pull_request.head.repo.full_name != github.repository)
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
     - uses: actions/setup-node@v4
       with:
         node-version: '18'