Update mypy requirement from <1.5.0,>=1.0.0 to >=1.0.0,<1.6.0

Updates the requirements on [mypy](https://github.com/python/mypy) to permit the latest version.
- [Commits](python/mypy@v1.0.0...v1.5.0)

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

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

setup.cfg

@@ -28,7 +28,7 @@ packages =
     zope-stubs
 package_dir = =src
 install_requires =
-    mypy>=1.0.0,<1.5.0
+    mypy>=1.0.0,<1.6.0
     zope.interface
     zope.schema
 include_package_data = True