Dev: ChangeLog: update ChangeLog for release 4.6.0-rc2

ChangeLog

@@ -1,4 +1,13 @@
-*Thu Dec 7 2023 Xin Liang <[email protected]>
+* Fri Dec 22 2023 Xin Liang <[email protected]>
+- Release 4.6.0 rc2
+- Dev: ui_cluster: Move --use-ssh-agent to optional arguments
+- Fix: autoconf: --with-version does not override the variable used in `version.in`
+- Dev: unify version string used in setup.py and autotools
+- Fix: ui_cluster: Improve the process of 'crm cluster stop' (bsc#1213889)
+- Fix: scripts.health: call `setup_logging()` before importing crmsh.reprot.utils
+- Dev: log: save backtrace of ValueError in logfile and suppress it in console
+
+* Thu Dec 7 2023 Xin Liang <[email protected]>
 - Release 4.6.0 rc1
 - Dev: doc: Unify contents of manpage and help info
 - Dev: report: Rewrite crm report module