build: Pin pip version to 21.1.3 in Salt master image #4887

Job	Run time
changed-files	15s
build-devcontainer / build-and-publish-devcontainer	23s
build-shell-ui	0s
unit_tests_ui	0s
integration_tests_ui	0s
build_integration_container_nginx	0s
unit_tests_crd_client_generator	0s
unit_tests_shell_ui	0s
lint	4m 47s
build / build-shell-ui / shell-ui	1m 17s
build / build-devcontainer / build-and-publish-devcontainer	14s
unit_tests_lib_alert_tree	0s
build-docs	0s
unit_tests_salt	0s
unit_tests_metalk8s_operator	0s
unit_tests_storage_operator	0s
build / build	17m 11s
build / build-docs / build-devcontainer / build-and-publish-devcontainer	15s
build / build-docs / docs	2m 16s
build / write-final-status	12s
e2e-tests / single-node-e2e / single-node	1h 12m 53s
e2e-tests / multi-node-e2e / multi-node	1h 46m 7s
e2e-tests / single-node-e2e / destroy-single-node-cluster	7m 23s
e2e-tests / multi-node-e2e / destroy-multi-node-cluster	7m 21s
write-final-status	9s
	3h 40m 43s

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