build(deps-dev): bump autoflake from 1.4 to 1.5.3

[dependabot[bot]]

Bumps autoflake from 1.4 to 1.5.3.

Commits

• 4093e23 Bump to 1.5.3
• 07c7015 test_autoflake: use os.linesep in assertion
• 3f8232a Make sure messages use os.linesep
• e7a0276 test_autoflake: add a test for #129
• 3a16b7d autoflake: propagate the exit status instead of calling sys.exit
• a136c84 Renamed the head branch
• 65c7102 Remove Makefile and reference to travis.yml
• 691ae7a Bump to 1.5.2
• 2a4877a Use the new sysconfig module instead of distutils
• 3aed3dd added option to remove RHS also when removing unused variables (#92)
• Additional commits viewable in compare view

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