Bump docker/build-push-action from 6.14.0 to 6.15.0

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 6.14.0 to 6.15.0.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v6.14.0...v6.15.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/build_client.yml

@@ -33,7 +33,7 @@ jobs:
         run: bash .github/version_extractor.sh client/requirements.txt client
 
       - name: Build and push latest Debian image
-        uses: docker/build-push-action@v6.14.0
+        uses: docker/build-push-action@v6.15.0
         with:
           context: ./client
           file: ./client/Dockerfile
@@ -66,7 +66,7 @@ jobs:
         run: bash .github/version_extractor.sh client/requirements.txt client
 
       - name: Build and push latest Alpine image
-        uses: docker/build-push-action@v6.14.0
+        uses: docker/build-push-action@v6.15.0
         with:
           context: ./client
           file: ./client/Dockerfile-alpine

.github/workflows/build_server.yml

@@ -33,7 +33,7 @@ jobs:
         run: bash .github/version_extractor.sh server/requirements.txt server
 
       - name: Build and push latest Debian image
-        uses: docker/build-push-action@v6.14.0
+        uses: docker/build-push-action@v6.15.0
         with:
           context: ./server
           file: ./server/Dockerfile
@@ -66,7 +66,7 @@ jobs:
         run: bash .github/version_extractor.sh server/requirements.txt server
 
       - name: Build and push latest Alpine image
-        uses: docker/build-push-action@v6.14.0
+        uses: docker/build-push-action@v6.15.0
         with:
           context: ./server
           file: ./server/Dockerfile-alpine