Bump pre-commit from 2.17.0 to 2.18.1

Bumps [pre-commit](https://github.com/pre-commit/pre-commit) from 2.17.0 to 2.18.1.
- [Release notes](https://github.com/pre-commit/pre-commit/releases)
- [Changelog](https://github.com/pre-commit/pre-commit/blob/main/CHANGELOG.md)
- [Commits](https://github.com/pre-commit/pre-commit/compare/v2.17.0...v2.18.1)

---
updated-dependencies:
- dependency-name: pre-commit
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

requirements.txt

@@ -47,7 +47,7 @@ humanfriendly==10.0; python_version >= '2.7' and python_version not in '3.0, 3.1
 hyperlink==21.0.0
 idna==3.3; python_version >= '3.5'
 imap-tools==0.53.0
-img2pdf==0.4.3
+img2pdf==0.4.4
 importlib-resources==5.6.0; python_version < '3.9'
 incremental==21.3.0
 inotify-simple==1.3.5; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3'