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

Author: renovate[bot]

.github/workflows/build-docker.yml

@@ -11,7 +11,7 @@ jobs:
   build-docker:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v3
         with:

.github/workflows/build.yml

@@ -14,7 +14,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-go@v5
         with:
           check-latest: true