Update pydantic requirement from <2 to <3 (#439)

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...v2.6.0)

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

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

pyproject.toml

@@ -49,7 +49,7 @@ dependencies = [
     "tblib>=1.7.0,<2.0.0",
     "dataclasses-json",
     "ray[default]",
-    "pydantic<2",  # temporary pin until Ray supports pydantic 2.0
+    "pydantic<3",  # temporary pin until Ray supports pydantic 2.0
     "rich>=13",
     "filelock",
 ]