Bump pydantic from 1.10.7 to 2.6.3 in /caster-back

Bumps [pydantic](https://github.com/pydantic/pydantic) from 1.10.7 to 2.6.3.
- [Release notes](https://github.com/pydantic/pydantic/releases)
- [Changelog](https://github.com/pydantic/pydantic/blob/main/HISTORY.md)
- [Commits](pydantic/pydantic@v1.10.7...v2.6.3)

---
updated-dependencies:
- dependency-name: pydantic
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

caster-back/requirements.txt

@@ -7,7 +7,7 @@ strawberry-graphql-django==0.17.2
 strawberry-graphql[channels]<=0.208.2
 django-cors-headers==4.0.0
 mistletoe==1.2.1
-pydantic==1.10.7
+pydantic==2.6.3
 channels-redis==4.1.0
 sentry-sdk==1.30.0
 django-stubs-ext==4.2.2