Update dependency storybook to v7.6.18 #8567

Job	Run time
Metadata	7s
Install Dependencies	3m 23s
i18n	29s
Lint	3m 17s
Admin tests - Chrome	3m 24s
Browser tests	0s
Database tests (Node 18.12.1, mysql8)	6m 43s
Database tests (Node 20.11.1, mysql8)	5m 58s
Performance tests	0s
Regression tests (Node 18.12.1, mysql8)	3m 1s
Database tests (Node 18.12.1, sqlite3)	3m 48s
Unit tests (Node 18.12.1)	2m 24s
Regression tests (Node 18.12.1, sqlite3)	1m 54s
Unit tests (Node 20.11.1)	2m 11s
Admin-X Settings tests	4m 22s
Comments-UI tests	1m 9s
Ghost-CLI tests	4m 11s
Signup-form tests	59s
All required tests passed or skipped	1s
Coverage	12s
Canary	0s
	47m 33s

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