Update actions's version

[newwingbird]

Chore

I have found the actions of the older version.
If there is no reason why you are using an older version, I would be happy to help you.

Describe the chore

Both actions can be updated to v4.

supabase-js/.github/workflows/docs.yml

Lines 19 to 25 in a8f4e90

	steps:
	- uses: actions/checkout@v2
	- name: Set up Node
	uses: actions/setup-node@v2
	with:
	node-version: ${{ matrix.node }}

[soedirgo]

Closed in #1282