Bump flake8-comprehensions from 3.1.2 to 3.1.3 (#1015)

Bumps [flake8-comprehensions](https://github.com/adamchainz/flake8-comprehensions) from 3.1.2 to 3.1.3.
- [Release notes](https://github.com/adamchainz/flake8-comprehensions/releases)
- [Changelog](https://github.com/adamchainz/flake8-comprehensions/blob/master/HISTORY.rst)
- [Commits](adamchainz/flake8-comprehensions@3.1.2...3.1.3)

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