ci(workflow): add cache to workflows using actions/setup-node

[oscard0m]

Description

Add cache to workflows using actions/setup-node

Context

setup-node GitHub Action just released a new option to add cache to steps using it.

You can find the details here: https://github.blog/changelog/2021-07-02-github-actions-setup-node-now-supports-dependency-caching/

Fix #1153

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[waylan]

There is way to many changes to whitespace here that I can't even see what the substantive change was. If the whitespace changes are removed, I'll be happy to review.

[oscard0m]

There is way to many changes to whitespace here that I can't even see what the substantive change was. If the whitespace changes are removed, I'll be happy to review.

You can see the changes without whitespaces in this link: https://github.com/Python-Markdown/markdown/pull/1152/files?diff=unified&w=1

If still is noisy I can remove those whitespaces (it's the result of running prettier to the file but I can remove these indentations if you want)

[waylan]

If still is noisy I can remove those whitespaces (it's the result of running prettier to the file but I can remove these indentations if you want)

Yes, please do.