Update mypy requirement from ~=1.8 to ~=1.9 in /ada

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@v1.8.0...1.9.0)

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

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

ada/requirements-dev.txt

@@ -1,3 +1,3 @@
-mypy~=1.8
+mypy~=1.9
 pylint~=3.1.0
 git+https://github.com/matangover/mypyls.git#egg=mypyls