Bump drf-yasg from 1.21.7 to 1.21.8 in /requirements #3046

Job	Run time
test_make_docker_configuration	14s
context	7s
Skip CI Image	3s
test_run_docker_action	4m 19s
docs_build	4m 13s
locales	5m 48s
test / test (Needs Locale Compilation, docker-compose.yml:docker-compose.ci.yml, make compile_locales ma...	5m 53s
test / test (Static Assets, docker-compose.yml:docker-compose.ci.yml, make test_static_assets)	4m 44s
test_main / test_config	4s
test / test (Internal Routes, docker-compose.yml:docker-compose.ci.yml, make test_internal_routes_allowed)	5m 35s
test / test (Elastic Search, docker-compose.yml:docker-compose.ci.yml, make test_es_tests)	6m 52s
test / test (Codestyle, web, docker-compose.yml:docker-compose.ci.yml, make lint-codestyle)	4m 38s
test / test (Manage Check, web nginx, docker-compose.yml:docker-compose.ci.yml, make check)	4m 10s
test_main / test_main (1)	7m 9s
test_main / test_main (2)	7m 12s
test_main / test_main (3)	7m 23s
test_main / test_main (4)	7m 44s
test_main / test_main (5)	1m 7s
test_main / test_main (6)	7m 9s
test_main / test_main (7)	7m 28s
test_main / test_main (8)	7m 48s
test_main / test_main (9)	7m 30s
test_main / test_main (10)	7m 50s
test_main / test_main (11)	7m 53s
test_main / test_main (12)	7m 48s
test_main / test_main (13)	7m 19s
test_main / test_main (14)	6m 53s
docs_deploy	0s
test_main / test_log	6s
Push Production Docker Image (GAR)	0s
Push Production Docker Image (Dockerhub)	0s
	2h 24m 59s

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