Revert "Bump ubuntu to 24.04"

This reverts commit ddf9186.

Author: dianqk

src/ci/docker/host-x86_64/x86_64-gnu-distcheck/Dockerfile

@@ -1,5 +1,5 @@
 # Runs `distcheck`, which is a collection of smoke tests:
-#
+# 
 # - Run `make check` from an unpacked dist tarball to make sure we can at the
 #   minimum run check steps from those sources.
 # - Check that selected dist components at least have expected directory shape
@@ -10,7 +10,7 @@
 #
 # FIXME(#136822): dist components are generally under-tested.
 
-FROM ubuntu:24.04
+FROM ubuntu:22.04
 
 ARG DEBIAN_FRONTEND=noninteractive
 RUN apt-get update && apt-get install -y --no-install-recommends \