Update docker/setup-buildx-action digest to aa33708 (#62)

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

Author: renovate[bot]

.github/workflows/docker-publish.yml

@@ -45,7 +45,7 @@ jobs:
 
       # Workaround: https://github.com/docker/build-push-action/issues/461
       - name: Setup Docker buildx
-        uses: docker/setup-buildx-action@2ad185228a349d19414702819e06df9fa4314287
+        uses: docker/setup-buildx-action@aa33708b10e362ff993539393ff100fa93ed6a27
 
       # Login against a Docker registry except on PR
       # https://github.com/docker/login-action