build(deps): bump systemd/mkosi

Bumps [systemd/mkosi](https://github.com/systemd/mkosi) from 5866c0ff3b36d350c943016e5a3b115f7a95d37f to c6dd95b6eae0386579071cbf44fd838ce28b7237.
- [Release notes](https://github.com/systemd/mkosi/releases)
- [Changelog](https://github.com/systemd/mkosi/blob/main/NEWS.md)
- [Commits](systemd/mkosi@5866c0f...c6dd95b)

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

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

Author: dependabot[bot]

.github/workflows/mkosi.yml

@@ -76,7 +76,7 @@ jobs:
 
     steps:
     - uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9
-    - uses: systemd/mkosi@5866c0ff3b36d350c943016e5a3b115f7a95d37f
+    - uses: systemd/mkosi@c6dd95b6eae0386579071cbf44fd838ce28b7237
 
     - name: Configure
       run: |