chore(deps): bump docker/build-push-action from 2 to 6

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 2 to 6.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v2...v6)

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

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

Author: dependabot[bot]

.github/workflows/prepare_release.yaml

@@ -117,7 +117,7 @@ jobs:
 
       - name: Build Docker Image and Save
         if: matrix.build.outputs.type == 'image'
-        uses: docker/build-push-action@v2
+        uses: docker/build-push-action@v6
         with:
           push: false
           context: .
@@ -128,7 +128,7 @@ jobs:
 
       - name: Build Docker Image
         if: matrix.build.outputs.type == 'file'
-        uses: docker/build-push-action@v2
+        uses: docker/build-push-action@v6
         with:
           push: false
           context: .

.github/workflows/test_pull_request.yaml

@@ -106,7 +106,7 @@ jobs:
         uses: docker/setup-buildx-action@v1
 
       - name: Build and push
-        uses: docker/build-push-action@v2
+        uses: docker/build-push-action@v6
         with:
           push: false
           context: .