Update pydantic requirement from ~=2.6.2 to ~=2.6.3

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@v2.6.2...v2.6.3)

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

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

requirements.txt

@@ -16,7 +16,7 @@ anyio<5.0.0
 sniffio~=1.3.1
 asgiref~=3.7.2
 certifi~=2024.2.2
-pydantic~=2.6.2
+pydantic~=2.6.3
 pip==24.0
 six~=1.16.0
 click~=8.1.7