Update and setup dependabot for github actions

.github/dependabot.yml

@@ -9,3 +9,8 @@ updates:
     directory: "/"
     schedule:
       interval: "weekly"
+
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "monthly"

.github/workflows/docker-build.yml

@@ -21,19 +21,19 @@ jobs:
       packages: write
     steps:
       - name: Checkout sources
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       # Action reference: https://github.com/docker/setup-qemu-action
       - name: Set up QEMU (for docker buildx)
-        uses: docker/setup-qemu-action@v1
+        uses: docker/setup-qemu-action@v3
 
       # Action reference: https://github.com/docker/setup-buildx-action
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v1
+        uses: docker/setup-buildx-action@v3
 
       # Action reference: https://github.com/docker/login-action
       - name: Login to GitHub Container Registry
-        uses: docker/login-action@v1
+        uses: docker/login-action@v3
         with:
           registry: ghcr.io
           username: ${{ github.repository_owner }}
@@ -43,13 +43,13 @@ jobs:
       # Action reference: https://github.com/ASzc/change-string-case-action
       - id: repository_owner
         name: lower case repository owner name
-        uses: ASzc/change-string-case-action@v1
+        uses: ASzc/change-string-case-action@v6
         with:
           string: ${{ github.repository_owner }}
 
       # Action reference: https://github.com/docker/build-push-action
       - name: Build container
-        uses: docker/build-push-action@v2
+        uses: docker/build-push-action@v5
         with:
           context: ./build/base
           platforms: linux/amd64,linux/ppc64le