Bump gtts from 2.3.2 to 2.5.1

Bumps [gtts](https://github.com/pndurette/gTTS) from 2.3.2 to 2.5.1.
- [Release notes](https://github.com/pndurette/gTTS/releases)
- [Changelog](https://github.com/pndurette/gTTS/blob/main/CHANGELOG.md)
- [Commits](https://github.com/pndurette/gTTS/compare/v2.3.2...v2.5.1)

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

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

requirements.txt

@@ -1,6 +1,6 @@
 boto3==1.26.142
 botocore==1.29.142
-gTTS==2.3.2
+gTTS==2.5.1
 moviepy==1.0.3
 playwright==1.34.0
 praw==7.7.0