chore(deps): update actions/checkout action to v7 #26829

Job	Run time
reuse-compliance	17s
check-bundle-size	3m 30s
build / Build (19)	1m 38s
build / Build (18)	1m 56s
lint	1m 52s
deploy-next-docs	1m 49s
test / MCP Server	3m 2s
test / Playwright (18)	3m 34s
test / Playwright (19)	2m 57s
test / Cypress (main/src/internal, 19)	1m 53s
test / Cypress (cypress-commands, 18)	2m 33s
test / Cypress (main/src/components, 19)	7m 36s
test / Cypress (cypress-commands, 19)	1m 38s
test / Cypress (main/src/webComponents, 19)	1m 39s
test / Cypress (compat, 19)	2m 8s
test / Cypress (main/src/webComponents, 18)	2m 12s
test / Cypress (compat, 18)	2m 37s
test / Cypress (main/src/internal, 18)	2m 30s
test / Cypress (main/src/components, 18)	8m 23s
test / Cypress (base, 18)	3m 7s
test / Cypress (base, 19)	2m 30s
test / Combine Coverage	5s
	59m 26s

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