Prepare for 2.15.0-rc1 release

Author: cowtowncoder

pom.xml

@@ -8,7 +8,7 @@
     <parent>
         <groupId>com.fasterxml.jackson</groupId>
         <artifactId>jackson-base</artifactId>
-        <version>2.15.0-rc1-SNAPSHOT</version>
+        <version>2.15.0-rc1</version>
     </parent>
     <groupId>com.fasterxml.jackson.module</groupId>
     <artifactId>jackson-module-kotlin</artifactId>

release-notes/VERSION-2.x

@@ -16,7 +16,7 @@ Co-maintainers:
 === Releases ===
 ------------------------------------------------------------------------
 
-2.15.0 (not yet released)
+2.15.0-rc1 (18-Mar-2023)
 
 #396: (regression) no default no-arguments constructor found
  (fix via [jackson-dataformat-xml#547])