Bump anyio from 3.7.1 to 4.2.0 (#421)

Bumps [anyio](https://github.com/agronholm/anyio) from 3.7.1 to 4.2.0.
- [Release notes](https://github.com/agronholm/anyio/releases)
- [Changelog](https://github.com/agronholm/anyio/blob/master/docs/versionhistory.rst)
- [Commits](agronholm/anyio@3.7.1...4.2.0)

---
updated-dependencies:
- dependency-name: anyio
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements/base.txt

@@ -33,7 +33,7 @@ tiktoken==0.5.2
 langchain==0.0.352
 langchain-experimental==0.0.40
 # For asynchronous event loop (Do not update: anyio<4.0 is REQUIRED by langchain)
-anyio==3.7.1
+anyio==4.2.0
 
 # Web scraping and parsing
 beautifulsoup4==4.12.2