chore(deps): update mypy requirement in /bots/gsbot

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@v1.7.1...v1.19.1)

---
updated-dependencies:
- dependency-name: mypy
  dependency-version: 1.19.1
  dependency-type: direct:production
...

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

Author: dependabot[bot]

bots/gsbot/requirements.txt

@@ -26,7 +26,7 @@ pytest-mock>=3.15.1
 # Code Quality
 black>=25.11.0
 flake8>=7.3.0
-mypy>=1.7.1
+mypy>=1.19.1
 pylint>=3.3.9
 
 # Utilities