Bump coverage from 7.6.8 to 7.6.9

Bumps [coverage](https://github.com/nedbat/coveragepy) from 7.6.8 to 7.6.9.
- [Release notes](https://github.com/nedbat/coveragepy/releases)
- [Changelog](https://github.com/nedbat/coveragepy/blob/master/CHANGES.rst)
- [Commits](nedbat/coveragepy@7.6.8...7.6.9)

---
updated-dependencies:
- dependency-name: coverage
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

requirements.txt

@@ -1,7 +1,7 @@
 Authlib==0.8
 flask-session==0.8.0
 loginpass==0.1.1
-coverage==7.6.8
+coverage==7.6.9
 Flask==2.2.3
 Flask-Markdown==0.3
 Flask-WTF==1.2.2