Bump docker/build-push-action from 3 to 4 (#626)

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 3 to 4.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v3...v4)

---
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>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/main.yml

@@ -46,7 +46,7 @@ jobs:
     steps:
     - uses: actions/checkout@v3
 
-    - uses: docker/build-push-action@v3 # Action page: <https://github.com/docker/build-push-action>
+    - uses: docker/build-push-action@v4 # Action page: <https://github.com/docker/build-push-action>
       with:
         context: .
         file: Dockerfile

.github/workflows/release_docker_image.yml

@@ -19,7 +19,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
       - uses: gacts/github-slug@v1 # Action page: <https://github.com/gacts/github-slug>
         id: slug
-      - uses: docker/build-push-action@v3 # Action page: <https://github.com/docker/build-push-action>
+      - uses: docker/build-push-action@v4 # Action page: <https://github.com/docker/build-push-action>
         with:
           context: .
           file: Dockerfile