fix(deps): update nextjs monorepo to v15 (major) #18577

Job	Run time
check-bundle-size	4m 5s
reuse-compliance	11s
Install Dependencies	1m 4s
lint	1m 40s
Build (18)	1m 36s
Build (19)	2m 8s
test / Cypress (base, 18)	2m 11s
test / Cypress (base, 19)	3m 12s
test / Cypress (charts, 18)	3m 22s
test / Cypress (charts, 19)	1m 46s
test / Cypress (cypress-commands, 18)	1m 31s
test / Cypress (cypress-commands, 19)	2m 21s
test / Cypress (main/src/components, 18)	5m 25s
test / Cypress (main/src/components, 19)	6m 5s
test / Cypress (main/src/internal, 18)	1m 33s
test / Cypress (main/src/internal, 19)	2m 19s
test / Cypress (compat, 18)	1m 46s
test / Cypress (compat, 19)	2m 19s
deploy-next-docs	0s
test / Combine Coverage	4s
	44m 38s

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