chore: prepare release v1.9.1 (#109)

Signed-off-by: Ville Vesilehto <ville.vesilehto@upcloud.com>

Author: thevilledev

CHANGELOG.md

@@ -5,6 +5,13 @@ See updating [Changelog example here](https://keepachangelog.com/en/1.0.0/)
 
 ## [Unreleased]
 
+## [1.9.1] - 2025-08-29
+
+### Fixed
+
+- Network interface validation in builder configuration
+- Vulnerability regarding LZMA archives in ulikunitz/xz (CVE-2025-58058)
+
 ## [1.9.0] - 2025-08-26
 
 ### Added
@@ -144,7 +151,8 @@ 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/v1.9.0...HEAD
+[Unreleased]: https://github.com/UpCloudLtd/packer-plugin-upcloud/compare/v1.9.1...HEAD
+[1.9.1]: https://github.com/UpCloudLtd/packer-plugin-upcloud/compare/v1.9.0...v1.9.1
 [1.9.0]: https://github.com/UpCloudLtd/packer-plugin-upcloud/compare/v1.8.1...v1.9.0
 [1.8.1]: https://github.com/UpCloudLtd/packer-plugin-upcloud/compare/v1.8.0...v1.8.1
 [1.8.0]: https://github.com/UpCloudLtd/packer-plugin-upcloud/compare/v1.7.0...v1.8.0