Update pydantic requirement from ~=2.5.1 to ~=2.6.4

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@v2.5.1...v2.6.4)

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

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

Author: dependabot[bot]

requirements.txt

@@ -1,5 +1,5 @@
 aiohttp~=3.9.0
-pydantic~=2.5.1
+pydantic~=2.6.4
 python-dateutil~=2.8.2
 typing-extensions~=4.9.0
 urllib3~=2.1.0