Bump mypy from 2.3.0 to 2.3.1 in /dev_requirements

Bumps [mypy](https://github.com/python/mypy) from 2.3.0 to 2.3.1.
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v2.3.0...v2.3.1)

---
updated-dependencies:
- dependency-name: mypy
  dependency-version: 2.3.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

dev_requirements/mypy_requirements.txt

@@ -1,5 +1,5 @@
 # Requirements for running MyPy check
 
-mypy==2.3.0
+mypy==2.3.1
 types-requests==2.33.0.20260712
 types-beautifulsoup4==4.12.0.20250516