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

plugins/php-imap/vendor/sebastian/cli-parser/ChangeLog.md

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+# ChangeLog
+
+All notable changes are documented in this file using the [Keep a CHANGELOG](https://keepachangelog.com/) principles.
+
+## [1.0.2] - 2024-03-02
+
+### Changed
+
+* Do not use implicitly nullable parameters
+
+## [1.0.1] - 2020-09-28
+
+### Changed
+
+* Changed PHP version constraint in `composer.json` from `^7.3 || ^8.0` to `>=7.3`
+
+## [1.0.0] - 2020-08-12
+
+* Initial release
+
+[1.0.2]: https://github.com/sebastianbergmann/cli-parser/compare/1.0.1...1.0.2
+[1.0.1]: https://github.com/sebastianbergmann/cli-parser/compare/1.0.0...1.0.1
+[1.0.0]: https://github.com/sebastianbergmann/cli-parser/compare/bb7bb3297957927962b0a3335befe7b66f7462e9...1.0.0