chore(deps): bump watchdog from 3.0.0 to 6.0.0 in /docs/main

Bumps [watchdog](https://github.com/gorakhargosh/watchdog) from 3.0.0 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@v3.0.0...v6.0.0)

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

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

docs/main/requirements.txt

@@ -26,4 +26,4 @@ regex==2023.8.8
 requests==2.31.0
 six==1.16.0
 urllib3==2.0.4
-watchdog==3.0.0
+watchdog==6.0.0