fix(deps): update nextjs monorepo to v15 (major) #18596

Job	Run time
check-bundle-size	3m 54s
Install Dependencies	1m 11s
reuse-compliance	8s
lint	1m 35s
Build (18)	1m 33s
Build (19)	2m 6s
test / Cypress (base, 18)	2m 16s
test / Cypress (base, 19)	2m 52s
test / Cypress (charts, 18)	3m 38s
test / Cypress (charts, 19)	1m 38s
test / Cypress (cypress-commands, 18)	1m 38s
test / Cypress (cypress-commands, 19)	2m 26s
test / Cypress (main/src/components, 18)	5m 58s
test / Cypress (main/src/components, 19)	5m 51s
test / Cypress (main/src/internal, 18)	1m 36s
test / Cypress (main/src/internal, 19)	2m 16s
test / Cypress (compat, 18)	1m 41s
test / Cypress (compat, 19)	2m 14s
deploy-next-docs	0s
test / Combine Coverage	2s
	44m 33s

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