fix(deps): update nextjs monorepo to v15 (major) #18639

Job	Run time
check-bundle-size	4m 22s
reuse-compliance	9s
Install Dependencies	1m 14s
Build (18)	1m 50s
Build (19)	2m 18s
lint	1m 44s
test / Cypress (base, 18)	2m 26s
test / Cypress (base, 19)	3m 44s
test / Cypress (charts, 18)	3m 21s
test / Cypress (charts, 19)	1m 53s
test / Cypress (cypress-commands, 18)	2m 2s
test / Cypress (cypress-commands, 19)	2m 27s
test / Cypress (main/src/components, 18)	5m 33s
test / Cypress (main/src/components, 19)	6m 27s
test / Cypress (main/src/internal, 18)	1m 56s
test / Cypress (main/src/internal, 19)	2m 21s
test / Cypress (compat, 18)	2m 3s
test / Cypress (compat, 19)	2m 38s
deploy-next-docs	0s
test / Combine Coverage	6s
	48m 34s

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