Bump django from 3.0.5 to 3.1.6 in /docs

Created by: dependabot[bot]

Bumps django from 3.0.5 to 3.1.6.

Commits

• 3235a7b [3.1.x] Bumped version for 3.1.6 release.
• 02e6592 [3.1.x] Fixed CVE-2021-3281 -- Fixed potential directory-traversal via archiv...
• 03a8678 [3.1.x] Fixed GeoIPTest.test04_city() failure with the latest GeoIP2 database.
• a271d8c [3.1.x] Modernized custom manager example
• 82e1294 [3.1.x] Fixed #32391 -- Used CSS flex properties for changelist filter.
• b920945 [3.1.x] Fixed #32388 -- Clarified QuerySet.bulk_update() caveat about duplica...
• fa203f1 [3.1.x] Fixed #32348, Refs #29087 -- Corrected tutorial for updated deleting ...
• 18adc89 [3.1.x] Refs #32372 -- Updated manager name in related objects reference docs.
• cc5ee23 [3.1.x] Fixed #32372 -- Made examples in related objects reference docs consi...
• 2a74248 [3.1.x] Fixed #32371 -- Doc'd jquery.init.js dependency for admin widgets.
• Additional commits viewable in compare view

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