Bump mypy from 0.740 to 0.750

Bumps [mypy](https://github.com/python/mypy) from 0.740 to 0.750.
- [Release notes](https://github.com/python/mypy/releases)
- [Commits](python/mypy@v0.740...v0.750)

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

Author: dependabot-preview[bot]

requirements.txt

@@ -1,3 +1,3 @@
 asserts==0.10.0
-mypy==0.740
+mypy==0.750
 wheel==0.33.6