update node version

[brian-smith-tcril]

The extract js translations workflow is currently using node 16

openedx-translations/.github/workflows/extract-translation-source-files.yml

Lines 351 to 355 in 834861f

	# Sets up node/npm
	- name: setup node
	uses: actions/setup-node@v4
	with:
	node-version: 16

we should at least update this to 20, but ideally future-proof it by having it use the nvmrc from the repo it is extracting translations from