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>

.github/workflows/coverage.yml

@@ -27,7 +27,7 @@ jobs:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
         with:
           persist-credentials: false
-      - uses: systemd/mkosi@66d51024b7149f40be4702e84275c936373ace97
+      - uses: systemd/mkosi@9a28ad20bbea61894ea7b971d318a71f4374cf3b
 
       # Freeing up disk space with rm -rf can take multiple minutes. Since we don't need the extra free space
       # immediately, we remove the files in the background. However, we first move them to a different location

.github/workflows/linter.yml

@@ -40,7 +40,7 @@ jobs:
           GITHUB_ACTIONS_CONFIG_FILE: actionlint.yml
           ENABLE_GITHUB_PULL_REQUEST_SUMMARY_COMMENT: false
 
-      - uses: systemd/mkosi@66d51024b7149f40be4702e84275c936373ace97
+      - uses: systemd/mkosi@9a28ad20bbea61894ea7b971d318a71f4374cf3b
 
       - name: Check that tabs are not used in Python code
         run: sh -c '! git grep -P "\\t" -- src/core/generate-bpf-delegate-configs.py src/boot/generate-hwids-section.py src/ukify/ukify.py test/integration-tests/integration-test-wrapper.py'

.github/workflows/mkosi.yml

@@ -169,7 +169,7 @@ jobs:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
         with:
           persist-credentials: false
-      - uses: systemd/mkosi@66d51024b7149f40be4702e84275c936373ace97
+      - uses: systemd/mkosi@9a28ad20bbea61894ea7b971d318a71f4374cf3b
 
       # Freeing up disk space with rm -rf can take multiple minutes. Since we don't need the extra free space
       # immediately, we remove the files in the background. However, we first move them to a different location