Update ChangeLog

Author: sebastianbergmann

ChangeLog-9.6.md

@@ -2,6 +2,12 @@
 
 All notable changes of the PHPUnit 9.6 release series are documented in this file using the [Keep a CHANGELOG](https://keepachangelog.com/) principles.
 
+## [9.6.4] - 2023-MM-DD
+
+### Fixed
+
+* [#5186](https://github.com/sebastianbergmann/phpunit/issues/5186): SBOM does not validate
+
 ## [9.6.3] - 2023-02-04
 
 ### Fixed
@@ -30,6 +36,7 @@ All notable changes of the PHPUnit 9.6 release series are documented in this fil
 * [#5064](https://github.com/sebastianbergmann/phpunit/issues/5064): Deprecate `PHPUnit\Framework\TestCase::getMockClass()`
 * [#5132](https://github.com/sebastianbergmann/phpunit/issues/5132): Deprecate `Test` suffix for abstract test case classes
 
+[9.6.4]: https://github.com/sebastianbergmann/phpunit/compare/9.6.3...9.6
 [9.6.3]: https://github.com/sebastianbergmann/phpunit/compare/9.6.2...9.6.3
 [9.6.2]: https://github.com/sebastianbergmann/phpunit/compare/9.6.1...9.6.2
 [9.6.1]: https://github.com/sebastianbergmann/phpunit/compare/9.6.0...9.6.1