Bump watchdog from 4.0.2 to 5.0.3 in /requirements

Bumps [watchdog](https://github.com/gorakhargosh/watchdog) from 4.0.2 to 5.0.3.
- [Release notes](https://github.com/gorakhargosh/watchdog/releases)
- [Changelog](https://github.com/gorakhargosh/watchdog/blob/master/changelog.rst)
- [Commits](gorakhargosh/watchdog@v4.0.2...v5.0.3)

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

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

requirements/dev.txt

@@ -2,4 +2,4 @@
 django-debug-toolbar==4.4.6
 isort==5.13.2
 pre-commit~=3.5.0
-watchdog==4.0.2
+watchdog==5.0.3