Update docker/build-push-action action to v7 (#478)

Co-authored-by: dependency-concierge[bot] <194671538+dependency-concierge[bot]@users.noreply.github.com>

Author: dependency-concierge[bot]

.github/workflows/pr-build.yaml

@@ -25,7 +25,7 @@ jobs:
 
       - name: Docker build
         if: ${{ matrix.apps  == 'api' || matrix.apps == 'migration' || matrix.apps == 'recommendations' }}
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: .
           push: false
@@ -34,7 +34,7 @@ jobs:
 
       - name: Docker build
         if: ${{ matrix.apps  == 'web' || matrix.apps == 'clustering' }}
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: ${{ matrix.apps }}
           push: false