Adds changelog for 12.1.3 (#7587)

Co-authored-by: Onur Tirtir <onurcantirtir@gmail.com>
Co-authored-by: Hanefi Onaldi <Hanefi.Onaldi@microsoft.com>

CHANGELOG.md

@@ -1,3 +1,43 @@
+### citus v12.1.3 (April 18, 2024) ###
+
+* Allows overwriting host name for all inter-node connections by
+  supporting "host" parameter in citus.node_conninfo (#7541)
+
+* Changes the order in which the locks are acquired for the target and
+  reference tables, when a modify request is initiated from a worker
+  node that is not the "FirstWorkerNode" (#7542)
+
+* Fixes a performance issue when distributing a table that depends on an
+  extension (#7574)
+
+* Fixes a performance issue when using "\d tablename" on a server with
+  many tables (#7577)
+
+* Fixes a crash caused by some form of ALTER TABLE ADD COLUMN
+  statements. When adding multiple columns, if one of the ADD COLUMN
+  statements contains a FOREIGN constraint omitting the referenced
+  columns in the statement, a SEGFAULT was occurring. (#7522)
+
+* Fixes a performance issue when creating distributed tables if many
+  already exist (#7575, #7579)
+
+* Fixes a bug when hostname in pg_dist_node resolves to multiple IPs
+  (#7377)
+
+* Fixes performance issue when tracking foreign key constraints on
+  systems with many constraints (#7578)
+
+* Fixes segmentation fault when using CASE WHEN in DO block within
+  functions. (#7554)
+
+* Fixes undefined behavior in master_disable_node due to argument
+  mismatch (#7492)
+
+* Fixes some potential bugs by correctly marking some variables as
+  volatile (#7570)
+
+* Logs username in the failed connection message (#7432)
+
 ### citus v11.0.10 (February 15, 2024) ###
 
 * Removes pg_send_cancellation and all references (#7135)