Update dependency djangorestframework to ~3.14.0 (next)

[renovate[bot]]

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This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
djangorestframework (source, changelog)	~3.13.1 -> ~3.14.0

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[glennmatthews]

check-schema is failing because of https://github.com/tfranzel/drf-spectacular/issues/816, fixed in 0.24.1 and later. Need to update the minimum drf-spectacular version in concert with this change.