build(deps): bump systemd/mkosi

Bumps [systemd/mkosi](https://github.com/systemd/mkosi) from 792cbc60eb2dc4a58d66bb3c212bf92f8d50f6ea to 14. This release includes the previously tagged commit.
- [Release notes](https://github.com/systemd/mkosi/releases)
- [Changelog](https://github.com/systemd/mkosi/blob/main/NEWS.md)
- [Commits](https://github.com/systemd/mkosi/compare/792cbc60eb2dc4a58d66bb3c212bf92f8d50f6ea...c9772ec920f1cd03181ba14e6fe2c3d35ccb4f92)

---
updated-dependencies:
- dependency-name: systemd/mkosi
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/mkosi.yml

@@ -52,7 +52,7 @@ jobs:
 
     steps:
     - uses: actions/checkout@2541b1294d2704b0964813337f33b291d3f8596b
-    - uses: systemd/mkosi@792cbc60eb2dc4a58d66bb3c212bf92f8d50f6ea
+    - uses: systemd/mkosi@c9772ec920f1cd03181ba14e6fe2c3d35ccb4f92
 
     - name: Install
       run: sudo apt-get update && sudo apt-get install --no-install-recommends python3-pexpect python3-jinja2