Prep for 2.21.1 release

Author: cowtowncoder

pom.xml

@@ -48,7 +48,7 @@ of Jackson components maintained by FasterXML.com
   </scm>
 
   <properties>
-    <jackson.version>2.21.1-SNAPSHOT</jackson.version>
+    <jackson.version>2.21.1</jackson.version>
 
     <!-- 25-Sep-2019, tatu: With Jackson 2.x we release full patch-level versions
            of annotations BUT they are all identical, content-wise.

release-notes/VERSION-2.x

@@ -9,7 +9,7 @@ Jackson components (core, modules)
 === Releases (note: only includes patches with actual changes)
 ------------------------------------------------------------------------
 
-2.21.0 (not yet released)
+2.21.0 (18-Jan-2026)
 
 #115: Fix cycloneDX SBOM generation settings