Prepare release

Author: sebastianbergmann

ChangeLog-12.3.md

@@ -2,7 +2,7 @@
 
 All notable changes of the PHPUnit 12.3 release series are documented in this file using the [Keep a CHANGELOG](https://keepachangelog.com/) principles.
 
-## [12.3.9] - 2025-MM-DD
+## [12.3.9] - 2025-09-11
 
 ### Changed
 
@@ -103,7 +103,7 @@ All notable changes of the PHPUnit 12.3 release series are documented in this fi
 * [#6229](https://github.com/sebastianbergmann/phpunit/issues/6229): `Configuration::excludeTestSuite()`, use `Configuration::excludeTestSuites()` instead
 * [#6246](https://github.com/sebastianbergmann/phpunit/issues/6246): Using `#[CoversNothing]` on a test method
 
-[12.3.9]: https://github.com/sebastianbergmann/phpunit/compare/12.3.8...12.3
+[12.3.9]: https://github.com/sebastianbergmann/phpunit/compare/12.3.8...12.3.9
 [12.3.8]: https://github.com/sebastianbergmann/phpunit/compare/12.3.7...12.3.8
 [12.3.7]: https://github.com/sebastianbergmann/phpunit/compare/12.3.6...12.3.7
 [12.3.6]: https://github.com/sebastianbergmann/phpunit/compare/12.3.5...12.3.6

src/Runner/Version.php

@@ -35,7 +35,7 @@ public static function id(): string
         }
 
         if (self::$version === '') {
-            self::$version = (new VersionId('12.3.8', dirname(__DIR__, 2)))->asString();
+            self::$version = (new VersionId('12.3.9', dirname(__DIR__, 2)))->asString();
         }
 
         return self::$version;