Bump docker/build-push-action from 4 to 5

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 4 to 5.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v4...v5)

---
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/ci.yml

@@ -15,7 +15,7 @@ jobs:
     - name: 🧰 Set up Docker Buildx
       uses: docker/setup-buildx-action@v2
     - name: 🏗️ Build Docker image
-      uses: docker/build-push-action@v4
+      uses: docker/build-push-action@v5
       with:
         context: backend
         push: false
@@ -32,7 +32,7 @@ jobs:
     - name: 🧰 Set up Docker Buildx
       uses: docker/setup-buildx-action@v2
     - name: 🏗️ Build Docker image
-      uses: docker/build-push-action@v4
+      uses: docker/build-push-action@v5
       with:
         context: frontend
         push: false
@@ -73,7 +73,7 @@ jobs:
           webis/targer-backend
           ghcr.io/${{ github.repository }}/targer-backend
     - name: 🚀 Build and push image
-      uses: docker/build-push-action@v4
+      uses: docker/build-push-action@v5
       with:
         context: backend
         push: true
@@ -116,7 +116,7 @@ jobs:
           webis/targer-frontend
           ghcr.io/${{ github.repository }}/targer-frontend
     - name: 🚀 Build and push image
-      uses: docker/build-push-action@v4
+      uses: docker/build-push-action@v5
       with:
         context: frontend
         push: true