ci(deps): Bump docker/build-push-action from 5 to 6

---
updated-dependencies:
- dependency-name: docker/build-push-action
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -123,7 +123,7 @@ jobs:
       uses: docker/setup-buildx-action@v3
 
     - name: Build Docker image
-      uses: docker/build-push-action@v5
+      uses: docker/build-push-action@v6
       with:
         context: ./ViceMCP
         file: ./ViceMCP/Dockerfile

.github/workflows/release.yml

@@ -219,7 +219,7 @@ jobs:
         password: ${{ secrets.GITHUB_TOKEN }}
 
     - name: Build and push Docker image
-      uses: docker/build-push-action@v5
+      uses: docker/build-push-action@v6
       with:
         context: ./ViceMCP
         file: ./ViceMCP/Dockerfile