[release] version v3.1.0

Author: Dongwei

gradle.properties

@@ -26,7 +26,7 @@ systemProp.org.gradle.internal.publish.checksums.insecure=true
 # This is version for Calcite itself
 # Note: it should not include "-SNAPSHOT" as it is automatically added by build.gradle.kts
 # Release version can be generated by using -Prelease or -Prc=<int> arguments
-calcite.version=1.33.0-SNAPSHOT
+calcite.version=3.1.0
 # This is a version to be used from Maven repository. It can be overridden by localAvatica below
 calcite.avatica.version=1.26.0