Bump pbkdf2 from 3.1.2 to 3.1.5 in /frontend #516

Job	Run time
Frontend Check / React Check	1m 1s
Backend Check / Django Check	1m 52s
Frontend Check / Publish frontend	2m 2s
Build backend	0s
Build frontend	2m 29s
Deploy	0s
Publish Images	-1s
	7m 23s

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