Update runtime to `node16`

[targos]

node-pr-labeler/action.yml

Line 13 in d4cf1b8

using: 'node12'

Refs: https://github.com/nodejs/node/actions/runs/3892298358

Node.js 12 actions are deprecated. For more information see: https://github.blog/changelog/2022-09-22-github-actions-all-actions-will-begin-running-on-node16-instead-of-node12/. Please update the following actions to use Node.js 16: nodejs/node-pr-labeler@v1