chore: bump tests/mender-image-tests from `a9be0d2` to `5684966`

Bumps [tests/mender-image-tests](https://github.com/mendersoftware/mender-image-tests) from `a9be0d2` to `5684966`.
- [Release notes](https://github.com/mendersoftware/mender-image-tests/releases)
- [Commits](a9be0d2293...5684966507e5bd1810c1cebec16dd4fd3ab67974)

---
updated-dependencies:
- dependency-name: tests/mender-image-tests
  dependency-type: direct:production
...

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

tests/mender-image-tests

@@ -1 +1 @@
-Subproject commit a9be0d22934c3883abbf288797adec815bad5404
+Subproject commit 5684966507e5bd1810c1cebec16dd4fd3ab67974