chore(deps): update actions/checkout action to v4 #13898

Job	Run time
Check documentation	6m 11s
Enable PR merge	2s
Prepare build environment	1m 35s
Build and lint Airnode	2m 41s
E2E tests (admin)	3m 17s
Build all the Docker containers and push them to Docker Hub	6m 32s
Require a changeset	31s
Unit tests	14m 44s
E2E tests (node)	3m 31s
E2E tests (utilities)	3m 16s
E2E tests (validator)	59s
E2E Tests - examples	2m 55s
All tests passed	0s
	46m 14s

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