[pip] Update pydantic requirement from ~=2.5.3 to ~=2.6.1

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@v2.5.3...v2.6.1)

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

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

requirements.txt

@@ -3,7 +3,7 @@ aiomqtt~=2.0.0
 beanie~=1.25.0
 gpib-ctypes>=0.3.0
 prologix-gpib-async~=1.4.13
-pydantic~=2.5.3
+pydantic~=2.6.1
 python-decouple~=3.8
 simplejson~=3.19.2
 async_gpib~=2.1.2