Bump borgmatic[apprise] from 1.9.3 to 1.9.4

Bumps [borgmatic[apprise]](https://github.com/borgmatic-collective/borgmatic) from 1.9.3 to 1.9.4.
- [Release notes](https://github.com/borgmatic-collective/borgmatic/releases)
- [Changelog](https://github.com/borgmatic-collective/borgmatic/blob/main/NEWS)
- [Commits](borgmatic-collective/borgmatic@1.9.3...1.9.4)

---
updated-dependencies:
- dependency-name: borgmatic[apprise]
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

requirements.txt

@@ -1,5 +1,5 @@
 --extra-index-url https://dl.cloudsmith.io/public/borgmatic-collective/borgmatic/python/simple/
 
 borgbackup==1.4.0
-borgmatic[apprise]==1.9.3
+borgmatic[apprise]==1.9.4
 llfuse==1.5.1