Bump watchdog from 5.0.3 to 6.0.0 in /tests/UDKTests

Bumps [watchdog](https://github.com/gorakhargosh/watchdog) from 5.0.3 to 6.0.0.
- [Release notes](https://github.com/gorakhargosh/watchdog/releases)
- [Changelog](https://github.com/gorakhargosh/watchdog/blob/master/changelog.rst)
- [Commits](gorakhargosh/watchdog@v5.0.3...v6.0.0)

---
updated-dependencies:
- dependency-name: watchdog
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

tests/UDKTests/requirements.txt

@@ -3,4 +3,4 @@ psutil==6.0.0
 py7zr==0.22.0
 tqdm==4.66.5
 udk_configparser==1.1.1
-watchdog==5.0.3
+watchdog==6.0.0