Update mypy requirement from <1.4,>=1.0 to >=1.0,<1.6

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:development
...

Signed-off-by: dependabot[bot] <[email protected]>

dev-requirements.txt

@@ -2,7 +2,7 @@
 flake8
 
 # Static type checking
-mypy>=1.0,<1.4
+mypy>=1.0,<1.6
 
 # Automatic code formatting
 black>=23.1,<24.0