chore: prepare v3.8.1 release (#313)

Author: kangasta

CHANGELOG.md

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [3.8.1] - 2024-05-24
+
 ### Changed
 
 - Allow creating Kubernetes cluster without node-groups.
@@ -389,7 +391,8 @@ Initial public beta release :tada:
 ### Added
 - Current feature set added! First internal release
 
-[Unreleased]: https://github.com/UpCloudLtd/upcloud-cli/compare/v3.8.0...HEAD
+[Unreleased]: https://github.com/UpCloudLtd/upcloud-cli/compare/v3.8.1...HEAD
+[3.8.1]: https://github.com/UpCloudLtd/upcloud-cli/compare/v3.8.0...v3.8.1
 [3.8.0]: https://github.com/UpCloudLtd/upcloud-cli/compare/v3.7.0...v3.8.0
 [3.7.0]: https://github.com/UpCloudLtd/upcloud-cli/compare/v3.6.0...v3.7.0
 [3.6.0]: https://github.com/UpCloudLtd/upcloud-cli/compare/v3.5.0...v3.6.0