Bump django-axes from 5.0.20 to 5.2.2 in /backend

[dependabot-preview[bot]]

Bumps django-axes from 5.0.20 to 5.2.2.

Changelog

Sourced from django-axes's changelog.

5.2.2 (2020-01-08)

• Add missing proxy implementation for axes.handlers.proxy.AxesProxyHandler.get_failures. [aleksihakli]

5.2.1 (2020-01-08)

• Add django-reversion compatibility notes. [mark-mishyn]
• Add pluggable lockout responses and the AXES_LOCKOUT_CALLABLE configuration flag. [aleksihakli]

5.2.0 (2020-01-01)

• Add a test handler. [aidanlister]

5.1.0 (2019-12-29)

• Add pluggable user account whitelisting and the AXES_WHITELIST_CALLABLE configuration flag. [aleksihakli]

Commits

• dfaf678 Version 5.2.2
• e4929d2 Add missing get_failures handler proxy implementation
• 245ba03 Move admin site test case from abstract base class to implementation
• 2da4b71 Add Django 3.0 support tags to setup.py
• 53e6197 Version 5.2.1
• c1d5082 django-reversion compatibility documentation
• d3da797 Add configurable lockout callable
• 7f95777 Add Django 3.0 support
• de3bf47 Fix typos in 4_configuration.rst
• 98c2774 Bump coverage from 5.0.1 to 5.0.2 (#553)
• Additional commits viewable in compare view

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[marcinjosinski]

@dependabot rebase

[dependabot-preview[bot]]

Looks like this PR is already up-to-date with develop! If you'd still like to recreate it from scratch, overwriting any edits, you can request @dependabot recreate.