build(deps): bump mypy from 2.3.1 to 2.4.0 in /requirements

Bumps [mypy](https://github.com/python/mypy) from 2.3.1 to 2.4.0.
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v2.3.1...v2.4.0)

---
updated-dependencies:
- dependency-name: mypy
  dependency-version: 2.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements/requirements.txt

@@ -5,5 +5,5 @@ cvxpy == 1.9.3
 ecos == 2.0.14
 pytest == 9.1.0 # For unit test
 pytest-xdist == 3.8.0 # For unit test
-mypy == 2.3.1 # For unit test
+mypy == 2.4.0 # For unit test
 ruff == 0.17.1 # For unit test