[deps]: Update docker/build-push-action action to v6 (#157)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

.github/workflows/build.yml

@@ -85,7 +85,7 @@ jobs:
           unzip KeyConnector.zip -d src/KeyConnector/obj/build-output/publish
 
       - name: Build Docker image
-        uses: docker/build-push-action@ca052bb54ab0790a636c9b5f226502c73d547a25 # v5.4.0
+        uses: docker/build-push-action@1a162644f9a7e87d8f4b053101d1d9a712edc18c # v6.3.0
         with:
           context: src/KeyConnector
           file: src/KeyConnector/Dockerfile