Bump django from 2.2.16 to 2.2.17 in /backend

[dependabot-preview[bot]]

Bumps django from 2.2.16 to 2.2.17.

Commits

• c769f65 [2.2.x] Bumped version for 2.2.17 release.
• 3db9a7a [2.2.x] Set release date for 2.2.17.
• b4b8ca4 [2.2.x] Refs #31040 -- Doc'd Python 3.9 compatibility.
• 01742aa [2.2.x] Refs #31040 -- Fixed Python PendingDeprecationWarning in select_for_u...
• 87b9a8b [2.2.x] Refs #31040 -- Fixed crypt.crypt() call in test_hashers.py.
• 657fea5 [2.2.x] Skipped GetImageDimensionsTests.test_webp when WEBP is not installed.
• 0f6e73e [2.2.x] Added CVE-2020-24583 & CVE-2020-24584 to security archive.
• 65078cf [2.2.x] Added CVE-2020-13254 and CVE-2020-13596 to security archive.
• 0696540 [2.2.x] Post-release version bump.
• See full diff in compare view

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