Updates to GitHub Actions versions

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

Author: alexellis

.github/workflows/build.yml

@@ -31,7 +31,7 @@ jobs:
         run: echo "REPO_OWNER=$(echo ${{ github.repository_owner }} | tr '[:upper:]' '[:lower:]')" > $GITHUB_ENV
 
       - name: Build ${{ matrix.svc }}
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: ./gateway
           file: ./gateway/Dockerfile

.github/workflows/publish.yml

@@ -47,7 +47,7 @@ jobs:
         run: echo "REPO_OWNER=$(echo ${{ github.repository_owner }} | tr '[:upper:]' '[:lower:]')" > $GITHUB_ENV
 
       - name: Publish ${{ matrix.svc }}
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: ./gateway
           file: ./gateway/Dockerfile