Update docker/build-push-action digest to 64c9b14 (#495)

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

Author: renovate[bot]

.github/workflows/docker-ci.yml

@@ -52,7 +52,7 @@ jobs:
       # https://github.com/docker/build-push-action
       - name: Build and push Docker image
         id: build-and-push
-        uses: docker/build-push-action@9e436ba9f2d7bcd1d038c8e55d039d37896ddc5d
+        uses: docker/build-push-action@64c9b141502b80dbbd71e008a0130ad330f480f8
         with:
           context: .
           load: true

.github/workflows/docker-publish.yml

@@ -63,7 +63,7 @@ jobs:
       # https://github.com/docker/build-push-action
       - name: Build and push Docker image
         id: build-and-push
-        uses: docker/build-push-action@9e436ba9f2d7bcd1d038c8e55d039d37896ddc5d
+        uses: docker/build-push-action@64c9b141502b80dbbd71e008a0130ad330f480f8
         with:
           context: .
           push: true