Update pydantic requirement from ~=1.10.12 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@v1.10.12...v2.6.3)

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

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

gui/requirements.txt

@@ -1,6 +1,6 @@
 # Core
 streamlit~=1.29.0
-pydantic~=1.10.12
+pydantic~=2.6.3
 
 # Streamlit components
 streamlit-elements