make

[pip] Bump djangorestframework from 3.14.0 to 3.15.1 in /vreapis #729

Job	Run time
call-build-container-vreapis / build	1m 34s
call-build-container-vre-panel (test) / build	2m 12s
call-build-container-vre-panel (production) / build	2m 8s
	5m 54s

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