chore(deps): update dependency watchdog to v2.1.9

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
watchdog (changelog)	==2.1.8 -> ==2.1.9

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Release Notes

gorakhargosh/watchdog

### [`v2.1.9`](https://togithub.com/gorakhargosh/watchdog/releases/tag/v2.1.9) [Compare Source](https://togithub.com/gorakhargosh/watchdog/compare/v2.1.8...v2.1.9) - \[fsevents] Fix flakey test to assert that there are no errors when stopping the emitter. - \[inotify] Suppress occasional `OSError: [Errno 9] Bad file descriptor` at shutdown. [#​805](https://togithub.com/gorakhargosh/watchdog/issues/805) - \[watchmedo] Make `auto-restart` restart the sub-process if it terminates. [#​896](https://togithub.com/gorakhargosh/watchdog/issues/896) - \[watchmedo] Avoid zombie sub-processes when running `shell-command` without `--wait`. [#​405](https://togithub.com/gorakhargosh/watchdog/issues/405) :heart_decoration: Thanks to our beloved contributors: [@​samschott](https://togithub.com/samschott), [@​taleinat](https://togithub.com/taleinat), [@​altendky](https://togithub.com/altendky), [@​BoboTiG](https://togithub.com/BoboTiG)

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Unit Test Results

366 tests  ±0   366 :heavy_check_mark: ±0   27s :stopwatch: +2s 154 suites ±0       0 :zzz: ±0  154 files   ±0       0 :x: ±0 

Results for commit c297ce07. ± Comparison against base commit 2be91d91.