chore(deps): update dependency flake8 to v3.9.2

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
flake8 (changelog)	==3.8.4 -> ==3.9.2

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Configuration

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[what-the-diff[bot]]

PR Summary

• Upgraded flake8 version The version of flake8, a tool we use for checking our code quality, has been updated from 3.8.4 to 3.9.2. This will help us maintain a high standard of code, as it includes the latest enhancements and issue fixes from the flake8 community.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (caa2a34) 33.67% compared to head (9b2c2a5) 33.67%. Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #767 +/- ## ======================================= Coverage 33.67% 33.67% ======================================= Files 5 5 Lines 677 677 ======================================= Hits 228 228 Misses 449 449 ``` | [Flag](https://app.codecov.io/gh/JuryA/landscape_api_py3/pull/767/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Ji%C5%99%C3%AD+Altman) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/JuryA/landscape_api_py3/pull/767/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Ji%C5%99%C3%AD+Altman) | `33.67% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Ji%C5%99%C3%AD+Altman#carryforward-flags-in-the-pull-request-comment) to find out more.

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