Summary

Bump actions/checkout@v3, actions/setup-go@v4

Why?

• Linux (1.21) Cause warnings: the following actions uses node12 which is deprecated and will be forced to run on node16: actions/setup-go@v2, actions/checkout@v2.
  • see: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/