Update dependency watchdog to v2.1.8 (develop)

This MR contains the following updates:

Package	Type	Update	Change
watchdog (changelog)	dependencies	patch	==2.1.7 -> ==2.1.8

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Release Notes

gorakhargosh/watchdog

v2.1.8

Compare Source

• Fix adding failed emitters on observer schedule. (#​872)
• [inotify] Fix hang when unscheduling watch on a path in an unmounted filesystem. (#​869)
• [watchmedo] Fix broken parsing of --kill-after argument for the auto-restart command. (#​870)
• [watchmedo] Fix broken parsing of boolean arguments. (#​887)
• [watchmedo] Fix broken parsing of commands from auto-restart, and shell-command. (#​888)
• [watchmedo] Support setting verbosity level via -q/--quiet and -v/--verbose arguments. (#​889)

💟 Thanks to our beloved contributors: @​taleinat, @​kianmeng, @​palfrey, @​IlayRosenberg, @​BoboTiG

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