Bump parallel_tests from 4.8.0 to 4.9.0 #12682

Job	Run time
Build	4m 22s
Lint (rubocop)	1m 32s
Test (unit_models)	5m 8s
Lint (erblint)	1m 16s
Deployment To Review	0s
Test (unit_services)	1m 34s
Lint (dfe_analytics)	51s
Test (unit_forms)	1m 9s
Lint (yarn_lint_and_test)	1m 0s
Test (unit_components)	1m 7s
Test (unit_other)	2m 25s
Test (integration_auth)	1m 3s
Test (integration_find)	1m 16s
Test (integration_publish)	2m 14s
Test (integration_support)	1m 23s
Test (integration_other)	1m 10s
Parallel deployment before production	0s
Production deployment	0s
Sandbox deployment	0s
	27m 30s

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