Update actions to use Node.js 20

[cameronraysmith]

Following up for the next iteration of #626 , node 16 is now being deprecated relative to node 20

Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: r-lib/actions/... 
For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.

https://github.com/search?q=repo%3Ar-lib%2Factions%20node16&type=code

actions/pr-push/action.yml

Line 11 in 46e9e5f

using: 'node16'

[CeresBarros]

Will this change be propagated across all actions in r-lib/actions? If not, can a user set the node to 20 when using an action?

[CeresBarros]

Similarly internally used actions (e.g. actions/cache@v3 is used in setup-r-dependencies) also need to be updated to those using 'node20' (actions/cache@v4)

[florisvdh]

I got following list of actions in need of an update – note that was 5 days ago:

Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/checkout@v3, r-lib/actions/setup-pandoc@v2, r-lib/actions/setup-r@v2, actions/cache@v3

[gaborcsardi]

v2 uses Node 20 now.

[github-actions]

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