After release cleanups.

See #1978

Author: christophstrobl

parent/pom.xml

@@ -139,7 +139,7 @@
 		<javax-annotation-api>1.3.2</javax-annotation-api>
 
 		<!-- Used in asciidoc reference documentation -->
-		<releasetrain>2021.2.12</releasetrain>
+		<releasetrain>2021.2.13-SNAPSHOT</releasetrain>
 
 		<!-- To be overridden by individual modules -->
 		<java-module-name/>