Update maintenance release version

Author: citizenmatt

rider/gradle.properties

@@ -11,7 +11,7 @@ productVersion=2022.2
 # Used for published version, plus retrieving correct changelog notes
 # TODO: Should ideally come from the TC build. Manually incrementing for each release is error prone (RIDER-49929)
 # NOTE: When changing this, make sure that the CHANGELOG.md has a matching version, or at least has an "Unreleased" block
-maintenanceVersion=2
+maintenanceVersion=3
 
 # Set to "true" on the command line to skip building the dotnet tasks, as a no-op
 # nuget restore and msbuild takes too long