Prepare 8.24.0 release with Continuous Profiling

Simple version bump to support
https://gitlab.com/gitlab-org/gitlab-workhorse/-/merge_requests/461.

CHANGELOG

@@ -2,6 +2,10 @@
 
 Formerly known as 'gitlab-git-http-server'.
 
+v 8.24.0
+
+- Support Stackdriver Profiler through Labkit !461
+
 v 8.23.0
 
 - Don't set Cache-Control header for git archives !462

VERSION

-8.23.0
+8.24.0