chore(deps): update docker/setup-buildx-action digest to 7703e82 (#62)

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

.github/workflows/build.yml

@@ -38,7 +38,7 @@ jobs:
 
       # Workaround: https://github.com/docker/build-push-action/issues/461
       - name: Setup Docker buildx
-        uses: docker/setup-buildx-action@4c0219f9ac95b02789c1075625400b2acbff50b1
+        uses: docker/setup-buildx-action@7703e82fbced3d0c9eec08dff4429c023a5fd9a9
 
       # Login against a Docker registry except on PR
       # https://github.com/docker/login-action