Bump version to 2.5.2

VCS plugins changes:
- SourceGithub 2.3.1

Author: dregad

Source/MantisSourceBase.class.php

@@ -19,7 +19,7 @@ abstract class MantisSourceBase extends MantisPlugin
 	 * a change in the minimum required MantisBT version: 0=1.2; 1=1.3, 2=2.x.
 	 * The framework version is incremented when the plugin's core files change.
 	 */
-	const FRAMEWORK_VERSION = '2.5.1';
+	const FRAMEWORK_VERSION = '2.5.2';
 
 	/**
 	 * Minimum required MantisBT version.

SourceGithub/SourceGithub.php

@@ -15,7 +15,7 @@
 
 class SourceGithubPlugin extends MantisSourceGitBasePlugin {
 
-	const PLUGIN_VERSION = '2.3.0';
+	const PLUGIN_VERSION = '2.3.1';
 	const FRAMEWORK_VERSION_REQUIRED = '2.5.0';
 
 	const URL_API = 'https://api.github.com/';

docs/CHANGELOG.md

@@ -14,7 +14,7 @@ specification.
 
 ### Fixed
 
-- PHP 8.1 compatibility
+- github: PHP 8.1 compatibility
   [#391](https://github.com/mantisbt-plugins/source-integration/issues/391)