Deprecate nodejs12 and set-output

[kim0]

Thanks for this GH Action. While running it, I see two notices about deprecation (nodejs12, and set-output) as below. This issue is for resolving them by:

• Upgrading to nodejs16
• Using GH environment variables

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: aws-actions/configure-aws-credentials@v1Show less
--
The `set-output` 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/

[SnowCait]

@kim0
v1.4.0 is released.
Thank you!