chore(deps): update ubuntu:24.04 docker digest to a68b7d8

This MR contains the following updates:

Package	Type	Update	Change
ubuntu	final	digest	c2072af -> a68b7d8

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Dockerfile

 # renovate: datasource=docker
-ARG UBUNTU_IMAGE_TAG=24.04@sha256:c2072afab1848810176ac88daea6d9c714af8de454d8a574dafc6c41f355eb39
+ARG UBUNTU_IMAGE_TAG=24.04@sha256:a68b7d8b873b955e10337a18c79334a9d95dced834f85714890aa5ed7f6b2692
 FROM ubuntu:${UBUNTU_IMAGE_TAG}
 
 ARG WITH_IPERF=1