build(deps): bump watchdog from 2.1.5 to 2.1.6

Bumps [watchdog](https://github.com/gorakhargosh/watchdog) from 2.1.5 to 2.1.6.
- [Release notes](https://github.com/gorakhargosh/watchdog/releases)
- [Changelog](https://github.com/gorakhargosh/watchdog/blob/master/changelog.rst)
- [Commits](gorakhargosh/watchdog@v2.1.5...v2.1.6)

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

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

Author: dependabot[bot]

requirements.txt

@@ -18,5 +18,5 @@ requests == 2.26.0
 tweepy == 3.10.0
 urllib3 == 1.26.6
 venusian == 3.0.0
-watchdog == 2.1.5
+watchdog == 2.1.6
 yarl == 1.7.0