Bump docker/build-push-action from 5 to 6

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 5 to 6.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v5...v6)

---
updated-dependencies:
- dependency-name: docker/build-push-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/rest-server-continuous-deployment-main.yml

@@ -57,7 +57,7 @@ jobs:
         run: |
           cd rest-server && ./mvnw -Pnative native:compile
       - name: Build the native (GraalVM) Docker image
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           push: false
           tags: application/application:${{ github.sha }}

.github/workflows/rest-server-continuous-integration.yml

@@ -65,7 +65,7 @@ jobs:
         run: |
           cd rest-server && ./mvnw -Pnative native:compile
       - name: Build the native (GraalVM) Docker image
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           push: false
           tags: ${{ env.DOCKER_IMAGE_NAME }}:main

.github/workflows/rest-server-release.yml

@@ -59,7 +59,7 @@ jobs:
       - name: Login to GitHub Packages
         run: docker login -u ${{ github.actor }} -p ${{ secrets.GITHUB_TOKEN }} docker.pkg.github.com
       - name: Build the native (GraalVM) Docker image
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           push: false
           tags: ${{ env.DOCKER_IMAGE_NAME }}:${{ env.TAG_NAME }},${{ env.DOCKER_IMAGE_NAME }}:latest