build(deps): bump deepl from 1.20.0 to 1.21.0

Bumps [deepl](https://github.com/DeepLcom/deepl-python) from 1.20.0 to 1.21.0.
- [Release notes](https://github.com/DeepLcom/deepl-python/releases)
- [Changelog](https://github.com/DeepLcom/deepl-python/blob/main/CHANGELOG.md)
- [Commits](DeepLcom/deepl-python@v1.20.0...v1.21.0)

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

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

Author: dependabot[bot]

poetry.lock

@@ -15,7 +15,7 @@ python = "^3.8"
 python-telegram-bot = "^21.6"
 sebaubuntu-libs = "^1.5.0"
 twrpdtgen = "^3.0.0"
-deepl = "^1.20.0"
+deepl = "^1.21.0"
 speedtest-cli = "^2.1.3"
 PyGithub = "^2.5"
 GitPython = "^3.1.44"