Bump docker/build-push-action from 3 to 4

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>

.github/workflows/main.yml

@@ -102,7 +102,7 @@ jobs:
           fi
 
       - name: Build
-        uses: docker/build-push-action@v3
+        uses: docker/build-push-action@v4
         with:
           builder: ${{ steps.buildx.outputs.name }}
           context: .

.github/workflows/manual.yml

@@ -102,7 +102,7 @@ jobs:
           fi
 
       - name: Build
-        uses: docker/build-push-action@v3
+        uses: docker/build-push-action@v4
         with:
           builder: ${{ steps.buildx.outputs.name }}
           context: .