Bump whitenoise from 5.0.1 to 5.2.0 in /backend

[dependabot-preview[bot]]

Bumps whitenoise from 5.0.1 to 5.2.0.

Changelog

Sourced from whitenoise's changelog.

v5.2.0

• Add support for relative STATIC_URLs in settings, as allowed in Django 3.1.
• Add mimetype for .mjs (JavaScript module) files and use recommended text/javascript mimetype for .js files (thanks @hanswilw).
• Various documentation improvements (thanks @lukeburden).

v5.1.0

• Add a manifest_strict <WHITENOISE_MANIFEST_STRICT> setting to prevent Django throwing errors when missing files are referenced (thanks @MegacoderKim).

Commits

• f67cdf3 Release version 5.2.0
• 2f273a8 Add Django 3.1 to supported versions
• 3feb037 Merge pull request #259 from evansd/support-relative-static-url
• be3571a Merge pull request #260 from evansd/upgrade-test-deps
• a4a445a Merge branch 'lukeburden-brotli-cloudfront-docs' into master
• 89b7c82 Fix ReST syntax in docs
• 94b777f Upgrade test dependencies
• cbcdabf Ensure relative STATIC_URLs are supported
• a7b3ffc Add Django 3.1 release candidate to test matrix
• 68eb48a Add Amazon CloudFront config to ensure serving of pre-compressed gzip files
• Additional commits viewable in compare view

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