Update pydantic requirement from <2.0 to <3.0

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...v2.6.1)

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

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

pyproject.toml

@@ -17,7 +17,7 @@ description = "Specify step and flyscan paths in a serializable, efficient and P
 dependencies = [
     "numpy>=1.19.3",
     "click==8.1.3",
-    "pydantic<2.0",
+    "pydantic<3.0",
     "typing_extensions",
 ]
 dynamic = ["version"]