Prepare for 4.11.3 release (#2208)

Author: blink1073

doc/changelog.rst

@@ -1,7 +1,22 @@
 Changelog
 =========
 
-Changes in Version 4.11.2 (YYYY/MM/DD)
+Changes in Version 4.11.3 (2025/03/17)
+--------------------------------------
+
+Version 4.11.3 is a bug fix release.
+
+- Fixed a bug where a ``WaitQueueTimeoutError`` would cause the connection pool to be cleared.
+
+Issues Resolved
+...............
+
+See the `PyMongo 4.11.3 release notes in JIRA`_ for the list of resolved issues in this release.
+
+.. _PyMongo 4.11.3 release notes in JIRA: https://jira.mongodb.org/secure/ReleaseNote.jspa?projectId=10004&version=42695
+
+
+Changes in Version 4.11.2 (2025/03/03)
 --------------------------------------
 
 Version 4.11.2 is a bug fix release.