build(deps): update pydantic requirement from <2.0.0 to <3.0.0

Updates the requirements on [pydantic](https://github.com/pydantic/pydantic) to permit the latest version.
- [Release notes](https://github.com/pydantic/pydantic/releases)
- [Changelog](https://github.com/pydantic/pydantic/blob/main/HISTORY.md)
- [Commits](pydantic/pydantic@v0.0.2...v2.4.2)

---
updated-dependencies:
- dependency-name: pydantic
  dependency-type: direct:production
...

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

requirements.txt

@@ -1,4 +1,4 @@
 lightning >=2.0.0
 hivemind >=1.1.0, <=1.1.5; sys_platform == 'linux'
 
-pydantic <2.0.0  # fixme: lift when resolved
+pydantic <3.0.0  # fixme: lift when resolved