Add release notes for tf-serving 2.12.2

PiperOrigin-RevId: 549064028

Author: rtg0795

RELEASE.md

@@ -19,6 +19,20 @@
 * Revert "Fix tests broken by the new defaults info in SignatureDef." (commit: 663b375d8899e5937e67655f56ee6c888f4a084a)
 * Update version for 2.13.0-rc0 release. (#2151) (commit: f449ae3dc99bfd19a3e9dbfa213c8553222382e2)
 
+# Release 2.12.2
+
+## Major Features and Improvements
+
+* No major features or improvements.
+
+## Breaking Changes
+
+* No breaking changes.
+
+## Bug Fixes and Other Changes
+
+* This release is based on TF version 2.12.1
+
 # Release 2.12.1
 
 * This is a re-release of 2.12.0 (that was marked as bad). Please use this instead.