Start 2.20 branch; update 2.x to 2.21

Author: cowtowncoder

pom.xml

@@ -8,12 +8,12 @@
     <parent>
         <groupId>com.fasterxml.jackson</groupId>
         <artifactId>jackson-base</artifactId>
-        <version>2.20.1-SNAPSHOT</version>
+        <version>2.21.0-SNAPSHOT</version>
     </parent>
     <groupId>com.fasterxml.jackson.module</groupId>
     <artifactId>jackson-module-kotlin</artifactId>
     <name>jackson-module-kotlin</name>
-    <version>2.20.1-SNAPSHOT</version>
+    <version>2.21.0-SNAPSHOT</version>
     <packaging>bundle</packaging>
     <description>Add-on module for Jackson (https://github.com/FasterXML/jackson/) to support
         Kotlin language, specifically introspection of method/constructor parameter names,

release-notes/VERSION-2.x

@@ -16,6 +16,10 @@ Co-maintainers:
 === Releases ===
 ------------------------------------------------------------------------
 
+2.21.0 (not yet released)
+
+No changes since 2.20
+
 2.20.0 (28-Aug-2025)
 
 #1025: When a null is entered for a non-null parameter, the KotlinInvalidNullException is now thrown instead of the