chore: bump tests/mender-image-tests from `5684966` to `e40f056`

Bumps [tests/mender-image-tests](https://github.com/mendersoftware/mender-image-tests) from `5684966` to `e40f056`.
- [Release notes](https://github.com/mendersoftware/mender-image-tests/releases)
- [Commits](5684966507...e40f05676df9b0cbe82026e2768ee6d1fe961ed2)

---
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 5684966507e5bd1810c1cebec16dd4fd3ab67974
+Subproject commit e40f05676df9b0cbe82026e2768ee6d1fe961ed2