chore: bump docker/build-push-action from 5.4.0 to 6.18.0

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 5.4.0 to 6.18.0.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@ca052bb...2634353)

---
updated-dependencies:
- dependency-name: docker/build-push-action
  dependency-version: 6.18.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/build-test.yml

@@ -91,7 +91,7 @@ jobs:
           images: elementsinteractive/twyn
 
       - name: Build Docker image
-        uses: docker/build-push-action@ca052bb54ab0790a636c9b5f226502c73d547a25 # v5.4.0
+        uses: docker/build-push-action@263435318d21b8e681c14492fe198d362a7d2c83 # v6.18.0
         with:
           context: .
           file: ./Dockerfile

.github/workflows/publish.yml

@@ -60,7 +60,7 @@ jobs:
           images: elementsinteractive/twyn
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@ca052bb54ab0790a636c9b5f226502c73d547a25 # v5.4.0
+        uses: docker/build-push-action@263435318d21b8e681c14492fe198d362a7d2c83 # v6.18.0
         with:
           context: .
           file: ./Dockerfile