Update mypy requirement from ==1.9.* to ==1.10.* in /api

Updates the requirements on [mypy](https://github.com/python/mypy) to permit the latest version.
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@1.9.0...v1.10.0)

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

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

api/tests/requirements.txt

@@ -1,5 +1,5 @@
 flake8==7.0.*
-mypy==1.9.*
+mypy==1.10.*
 pytest==8.2.*
 pytest-cov==5.0.*
 httpx==0.27.*