Warning about set-output deprecated

[danez]

Bug description

I receive the following warning for this action

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/

From the blog:

Action authors who are using the toolkit should update the @actions/core package to v1.10.0 or greater to get the updated saveState and setOutput functions.

Environment

• pkg-size-action version: latest
• Operating System: not relevant
• Node version: not relevant