fix(deps): update nextjs monorepo to v15 (major) #18648

Job	Run time
check-bundle-size	4m 25s
Install Dependencies	1m 11s
reuse-compliance	9s
Build (18)	1m 51s
lint	1m 40s
Build (19)	2m 27s
test / Cypress (base, 18)	2m 0s
test / Cypress (base, 19)	2m 49s
test / Cypress (charts, 18)	3m 19s
test / Cypress (charts, 19)	1m 51s
test / Cypress (cypress-commands, 18)	2m 12s
test / Cypress (cypress-commands, 19)	2m 19s
test / Cypress (main/src/components, 18)	5m 28s
test / Cypress (main/src/components, 19)	6m 26s
test / Cypress (main/src/internal, 18)	1m 41s
test / Cypress (main/src/internal, 19)	2m 23s
test / Cypress (compat, 18)	1m 57s
test / Cypress (compat, 19)	2m 31s
deploy-next-docs	0s
test / Combine Coverage	4s
	46m 43s

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