Remove the vendor directory in .gitignore as these dependencies are needed for php-imap

plugins/php-imap/vendor/sebastian/complexity/ChangeLog.md

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+# ChangeLog
+
+All notable changes are documented in this file using the [Keep a CHANGELOG](https://keepachangelog.com/) principles.
+
+## [2.0.3] - 2023-12-22
+
+### Changed
+
+* This component is now compatible with `nikic/php-parser` 5.0
+
+## [2.0.2] - 2020-10-26
+
+### Fixed
+
+* `SebastianBergmann\Complexity\Exception` now correctly extends `\Throwable`
+
+## [2.0.1] - 2020-09-28
+
+### Changed
+
+* Changed PHP version constraint in `composer.json` from `^7.3 || ^8.0` to `>=7.3`
+
+## [2.0.0] - 2020-07-25
+
+### Removed
+
+* The `ParentConnectingVisitor` has been removed (it should have been marked as `@internal`)
+
+## [1.0.0] - 2020-07-22
+
+* Initial release
+
+[2.0.3]: https://github.com/sebastianbergmann/complexity/compare/2.0.2...2.0.3
+[2.0.2]: https://github.com/sebastianbergmann/complexity/compare/2.0.1...2.0.2
+[2.0.1]: https://github.com/sebastianbergmann/complexity/compare/2.0.0...2.0.1
+[2.0.0]: https://github.com/sebastianbergmann/complexity/compare/1.0.0...2.0.0
+[1.0.0]: https://github.com/sebastianbergmann/complexity/compare/70ee0ad32d9e2be3f85beffa3e2eb474193f2487...1.0.0