update to docker/setup-buildx-action@v3 for intermittent cache failure

see docker/buildx#681 for relevant buildx issue
the breaking change moving from v2 to v3 is the minimum node version is
bumped to 20, which is the minimum version we're building with already
(https://github.com/docker/setup-buildx-action/releases/tag/v3.0.0)

Author: emma-sg

.github/workflows/frontend-lint-test-build.yaml

@@ -286,7 +286,7 @@ jobs:
 
       # Check build:
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v2
+        uses: docker/setup-buildx-action@v3
         with:
           driver-opts: network=host