Bump ubuntu

Bumps ubuntu from `6042500` to `e6173d4`.

---
updated-dependencies:
- dependency-name: ubuntu
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

cje-production/dockerfiles/ubuntu-gtk3-metacity/22.04-gtk3/Dockerfile

@@ -1,4 +1,4 @@
-FROM ubuntu:22.04@sha256:6042500cf4b44023ea1894effe7890666b0c5c7871ed83a97c36c76ae560bb9b
+FROM ubuntu:22.04@sha256:e6173d4dc55e76b87c4af8db8821b1feae4146dd47341e4d431118c7dd060a74
 
 ### user name recognition at runtime w/ an arbitrary uid - for OpenShift deployments
 COPY scripts/uid_entrypoint /usr/local/bin/uid_entrypoint