chore(deps): bump apscheduler from 3.7.0 to 3.8.0

Bumps [apscheduler](https://github.com/agronholm/apscheduler) from 3.7.0 to 3.8.0.
- [Release notes](https://github.com/agronholm/apscheduler/releases)
- [Changelog](https://github.com/agronholm/apscheduler/blob/3.8.0/docs/versionhistory.rst)
- [Commits](agronholm/apscheduler@v3.7.0...3.8.0)

---
updated-dependencies:
- dependency-name: apscheduler
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements.txt

@@ -1,6 +1,6 @@
 dill==0.3.4
 slackclient==2.9.3
-apscheduler==3.7.0
+apscheduler==3.8.0
 blinker-alt==1.5
 clint==0.5.1
 dataclasses==0.7 ; python_version<'3.7'