Update mypy requirement from ~=1.5.0 to ~=1.6.0

Updates the requirements on [mypy](https://github.com/python/mypy) to permit the latest version.
- [Commits](python/mypy@v1.5.0...v1.6.0)

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

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

requirements.txt

@@ -52,7 +52,7 @@ matplotlib~=3.8.0
 matplotlib-inline~=0.1.6
 mistune~=3.0.1
 numpy~=1.26.0
-mypy~=1.5.0
+mypy~=1.6.0
 mypy-extensions~=1.0.0
 nbclient~=0.8.0
 nbsphinx==0.9.1