build(deps-dev): bump mypy from 1.20.2 to 2.1.0 in /api

Bumps [mypy](https://github.com/python/mypy) from 1.20.2 to 2.1.0.
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v1.20.2...v2.1.0)

---
updated-dependencies:
- dependency-name: mypy
  dependency-version: 2.1.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

api/pyproject.toml

@@ -21,7 +21,7 @@ dependencies = [
 [dependency-groups]
 dev = [
   "mongomock>=4.1.2",
-  "mypy>=1.20.2",
+  "mypy>=2.1.0",
   "pytest>=8.3.0",
   "types-cachetools>=7.0.0.20260503",
 ]