chore: prepare release v1.5.3 (#55)

Author: kangasta

CHANGELOG.md

@@ -5,6 +5,8 @@ See updating [Changelog example here](https://keepachangelog.com/en/1.0.0/)
 
 ## [Unreleased]
 
+## [1.5.3] - 2024-01-02
+
 ### Fixed
 - Update UpCloud Go SDK to v6 and fix security vulnerabilities
 
@@ -85,7 +87,8 @@ See updating [Changelog example here](https://keepachangelog.com/en/1.0.0/)
 - Upgrade to Packer 1.7.0
 - Copy codebase from https://github.com/UpCloudLtd/upcloud-packer
 
-[Unreleased]: https://github.com/UpCloudLtd/packer-plugin-upcloud/compare/v1.5.2...HEAD
+[Unreleased]: https://github.com/UpCloudLtd/packer-plugin-upcloud/compare/v1.5.3...HEAD
+[1.5.3]: https://github.com/UpCloudLtd/packer-plugin-upcloud/compare/v1.5.2...v1.5.3
 [1.5.2]: https://github.com/UpCloudLtd/packer-plugin-upcloud/compare/v1.5.1...v1.5.2
 [1.5.1]: https://github.com/UpCloudLtd/packer-plugin-upcloud/compare/v1.5.0...v1.5.1
 [1.5.0]: https://github.com/UpCloudLtd/packer-plugin-upcloud/compare/v1.4.0...v1.5.0