Update actions/checkout action to v4 (#2031)

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Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

.github/workflows/buildtest.yaml

@@ -25,7 +25,7 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: shogo82148/actions-setup-redis@v1
         with:
           redis-version: "6.x"

.github/workflows/docker.yaml

@@ -25,7 +25,7 @@ jobs:
   docker:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Docker meta
         id: meta
         uses: docker/metadata-action@v4

.github/workflows/release.yaml

@@ -28,7 +28,7 @@ jobs:
   release:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Fetch all tags
         run: git fetch --force --tags