Bump tiktoken from 0.4.0 to 0.6.0

Bumps [tiktoken](https://github.com/openai/tiktoken) from 0.4.0 to 0.6.0.
- [Release notes](https://github.com/openai/tiktoken/releases)
- [Changelog](https://github.com/openai/tiktoken/blob/main/CHANGELOG.md)
- [Commits](openai/tiktoken@0.4.0...0.6.0)

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

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

Author: dependabot[bot]

requirements-dev.txt

@@ -3,7 +3,7 @@ azure-ai-formrecognizer==3.2.1
 Markdown==3.4.4
 requests==2.31.0
 tqdm==4.65.0
-tiktoken==0.4.0
+tiktoken==0.6.0
 langchain==0.0.340
 bs4==0.0.1
 urllib3==2.0.6