Prepare next development iteration.

Set Spring Session (core) version to 2.6.0-SNAPSHOT.

Set version to 2.6.0-SNAPSHOT.

Author: jxblum

gradle.properties

@@ -10,6 +10,6 @@ springDataBomVersion=2021.1.0-RC1
 springDataCommonsVersion=2.6.0-RC1
 springDataGeodeVersion=2.6.0-RC1
 springDataGeodeTestVersion=0.0.26
-springSessionVersion=2.6.0-RC1
+springSessionVersion=2.6.0-SNAPSHOT
 springSessionBomVersion=2021.1.0-SNAPSHOT
-version=2.6.0-RC1
+version=2.6.0-SNAPSHOT