build(deps): bump systemd/mkosi
Bumps [systemd/mkosi](https://github.com/systemd/mkosi) from
66d51024b7149f40be4702e84275c936373ace97 to
9a28ad20bbea61894ea7b971d318a71f4374cf3b.
- [Release notes](https://github.com/systemd/mkosi/releases)
- [Commits](https://github.com/systemd/mkosi/compare/
66d51024b7149f40be4702e84275c936373ace97...
9a28ad20bbea61894ea7b971d318a71f4374cf3b)
---
updated-dependencies:
- dependency-name: systemd/mkosi
dependency-version:
9a28ad20bbea61894ea7b971d318a71f4374cf3b
dependency-type: direct:production
...
Signed-off-by: dependabot[bot] <support@github.com>