[pip] Update pydantic requirement from ~=2.8.2 to ~=2.9.0 (#32)

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@v2.8.2...v2.9.0)

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

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

requirements.txt

@@ -2,4 +2,4 @@ janus~=1.0.0
 pre-commit~=3.8.0
 python-decouple~=3.8
 scpi-protocol~=0.2.0
-pydantic~=2.8.2
+pydantic~=2.9.0