Update compatible-mypy 1.2.0 (#392)

* Update mypy requirement from <1.2,>=1.1.1 to >=1.1.1,<1.3

Updates the requirements on [mypy](https://github.com/python/mypy) to permit the latest version.
- [Release notes](https://github.com/python/mypy/releases)
- [Commits](python/mypy@v1.1.1...v1.2.0)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Marti Raudsepp <[email protected]>

setup.py

@@ -29,7 +29,7 @@ def find_stub_files(name: str) -> List[str]:
 ]
 
 extras_require = {
-    "compatible-mypy": ["mypy>=1.1.1,<1.2"],
+    "compatible-mypy": ["mypy>=1.2.0,<1.3"],
     "coreapi": ["coreapi>=2.0.0"],
     "markdown": ["types-Markdown>=0.1.5"],
 }