Bump apprise from 1.7.2 to 1.8.1

Bumps [apprise](https://github.com/caronc/apprise) from 1.7.2 to 1.8.1.
- [Release notes](https://github.com/caronc/apprise/releases)
- [Commits](caronc/apprise@v1.7.2...v1.8.1)

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

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