set-output will be deprecated in Github actions

[qinsoon]

See https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

These are what we need to do/check:

1. we need to change set-output to

echo "{name}={value}" >> $GITHUB_OUTPUT

2. Upgrade our self-hosted Github runner to 2.297.0 or above.