build(deps): bump docker/build-push-action from 6 to 7

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 6 to 7.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v6...v7)

---
updated-dependencies:
- dependency-name: docker/build-push-action
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/ci.yaml

@@ -127,7 +127,7 @@ jobs:
           key: ${{ runner.os }}-docker
 
       - name: Build Docker image
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: .
           push: false
@@ -147,7 +147,7 @@ jobs:
       #
       # see https://docs.docker.com/reference/cli/docker/buildx/build/#docker
       - name: Export amd64 Docker image for later usage
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: .
           push: false
@@ -184,7 +184,7 @@ jobs:
           key: ${{ runner.os }}-docker
 
       - name: Build Docker image
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: .
           push: false
@@ -449,7 +449,7 @@ jobs:
           key: ${{ runner.os }}-docker
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: .
           push: true
@@ -529,7 +529,7 @@ jobs:
           key: ${{ runner.os }}-docker
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         continue-on-error: true
         with:
           context: .