Bump tiktoken from 0.7.0 to 0.8.0

Bumps [tiktoken](https://github.com/openai/tiktoken) from 0.7.0 to 0.8.0.
- [Release notes](https://github.com/openai/tiktoken/releases)
- [Changelog](https://github.com/openai/tiktoken/blob/main/CHANGELOG.md)
- [Commits](openai/tiktoken@0.7.0...0.8.0)

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

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

requirements/prod.txt

@@ -32,7 +32,7 @@ pyTelegramBotAPI==4.22.1
 APScheduler==3.9.1.post1
 croniter==2.0.7
 faiss-cpu==1.8.0.post1
-tiktoken==0.7.0
+tiktoken==0.8.0
 RestrictedPython>=7.3
 AccessControl>=7.2
 timeout-decorator==0.5.0