chore(deps): pin ghcr.io/vexxhost/build-utils docker tag to 79d7579

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

Author: renovate[bot]

Dockerfile

@@ -6,7 +6,7 @@ ARG FROM
 FROM ${FROM}
 ENV PATH=/var/lib/openstack/bin:$PATH
 RUN --mount=type=bind,source=bindep.txt,target=/bindep.txt \
-    --mount=type=bind,from=ghcr.io/vexxhost/build-utils:latest,source=/bin,target=/build \
+    --mount=type=bind,from=ghcr.io/vexxhost/build-utils:latest@sha256:79d7579c2300391cc9cdd9ca17b9031750a748fb84a87ebb1f1a920e1fcb4740,source=/bin,target=/build \
     --mount=type=cache,target=/root/.cache/uv \
     --mount=type=cache,target=/root/.local/share/uv \
     /build/install-bindep-packages