Bump mypy from 0.720 to 0.740

Bumps [mypy](https://github.com/python/mypy) from 0.720 to 0.740.
- [Release notes](https://github.com/python/mypy/releases)
- [Commits](python/mypy@v0.720...v0.740)

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

Author: dependabot-preview[bot]

requirements.txt

@@ -1,3 +1,3 @@
 asserts==0.10.0
-mypy==0.720
+mypy==0.740
 wheel==0.33.6