version: Update version and changelog after 4.10 release.

docs/overview/changelog.md

@@ -121,6 +121,23 @@ log][commit-log] for an up-to-date list of raw changes.
 
 ## Zulip 4.x series
 
+## Zulip 4.10 -- 2022-02-25
+
+- CVE-2022-21706: Reusable invitation links could be improperly used
+  for other organizations.
+- CVE-2021-3967: Enforce that regenerating an API key must be done
+  with an API key, not a cookie. Thanks to nhiephon
+  (twitter.com/\_nhiephon) for their responsible disclosure of this
+  vulnerability.
+- Fixed a bug with the `reindex-textual-data` tool, where it would
+  sometimes fail to find the libraries it needed.
+- Pin PostgreSQL to 10.19, 11.14, 12.9, 13.5 or 14.1 to avoid a
+  regression which caused deploys with PGroonga enabled to
+  unpredictably fail database queries with the error
+  `variable not found in subplan target list`.
+- Fix ARM64 support; however, the wal-g binary is not yet supported on
+  ARM64 (zulip/zulip#21070).
+
 ## Zulip 4.9 -- 2022-01-24
 
 - CVE-2021-43799: Remote execution of code involving RabbitMQ.