fix(SelectDialog): adjust heading level to `h1` (#7594) #21279

Job	Run time
Install Dependencies	1m 4s
reuse-compliance	12s
check-bundle-size	0s
Build (19)	2m 17s
Build (18)	1m 46s
lint	1m 51s
test / Cypress (base, 18)	3m 3s
test / Cypress (charts, 18)	4m 20s
test / Cypress (charts, 19)	3m 45s
test / Cypress (base, 19)	2m 20s
test / Cypress (cypress-commands, 19)	1m 51s
test / Cypress (main/src/components, 19)	6m 38s
test / Cypress (main/src/components, 18)	6m 57s
test / Cypress (compat, 18)	2m 25s
test / Cypress (main/src/internal, 19)	1m 40s
test / Cypress (main/src/internal, 18)	2m 12s
test / Cypress (compat, 19)	2m 4s
test / Cypress (cypress-commands, 18)	2m 37s
deploy-next-docs	2m 59s
test / Combine Coverage	3s
	50m 4s

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