Bump jinja2 from 2.10 to 3.1.4 in /docs #3409

Job	Run time
build	6m 2s
linting-coverage	3m 28s
file-ft-tests	8m 52s
ceph-backend-test	4m 37s
kmip-ft-tests	1m 29s
mongo-v0-ft-tests	8m 5s
mongo-v1-ft-tests	8m 38s
multiple-backend	2m 3s
quota-tests (With Inflights, true)	1m 16s
utapi-v2-tests	1m 12s
quota-tests (Without Inflights, false)	1m 7s
	46m 49s

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