chore: bump pydantic from 2.6.4 to 2.7.3

Bumps [pydantic](https://github.com/pydantic/pydantic) from 2.6.4 to 2.7.3.
- [Release notes](https://github.com/pydantic/pydantic/releases)
- [Changelog](https://github.com/pydantic/pydantic/blob/main/HISTORY.md)
- [Commits](pydantic/pydantic@v2.6.4...v2.7.3)

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

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

requirements.txt

@@ -84,11 +84,11 @@ pyasn1-modules==0.3.0
     # via google-auth
 pycparser==2.21
     # via cffi
-pydantic==2.6.4
+pydantic==2.7.3
     # via
     #   -r requirements.in
     #   pytest-interface-tester
-pydantic-core==2.16.3
+pydantic-core==2.18.4
     # via pydantic
 pymacaroons==0.13.0
     # via macaroonbakery