update deprecated actoins for github actions

[mikecaat]

We need to update the action files since some actions are deprecated. The warnings are followings. https://github.com/ossc-db/pg_bulkload/actions/runs/3756021584

• 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: actions/cache@v2, actions/checkout@v2

• The save-state command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/