chore: Prepare 2.1.0 release

Signed-off-by: Ferdinand Thiessen <opensource@fthiessen.de>

Author: susnux

CHANGELOG.md

@@ -2,6 +2,14 @@
 
 All notable changes to this project will be documented in this file.
 
+## 2.1.0 - 2023-08-03
+### Added
+- Nextcloud 20 removal of `OCA.Search` \([\#165](https://github.com/nextcloud-libraries/eslint-plugin/pull/165)\)
+- Nextcloud 26 and Nextcloud 28 deprecations and removals \([\#156](https://github.com/nextcloud-libraries/eslint-plugin/pull/156)\)
+### Changed
+- Dependency updates
+- Node version updates to LTS (Node 20 and NPM 9)
+
 ## 2.0.0 - 2020-11-02
 ### Changed
 - ESLint updated to v7