Build/Test Tools: Explicitly specify a version number in the `.nvmrc` file for the 5.3 branch.

This ensures the ability to run NodeJS related tasks when using `nvm install` or `nvm use` will continue to be usable as new versions of NodeJS are moved into LTS.

The alias `lts/*` currently resolves to NodeJS 12.x (which is the highest version of NodeJS supported in the 5.3 branch). However, `lts/*` will point to newer versions in the near future.

This also removes the explicit version when running `nvm install` during automated testing. The command will now fall back to the version in the `.nvmrc` file.

See #51603.
Built from https://develop.svn.wordpress.org/branches/5.3@49279


git-svn-id: http://core.svn.wordpress.org/branches/5.3@49039 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/js/dist/a11y.js

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wp-includes/js/dist/a11y.min.js

@@ -1 +1 @@
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wp-includes/js/dist/dom.js

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wp-includes/js/dist/element.js

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wp-includes/js/dist/i18n.js

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wp-includes/js/dist/list-reusable-blocks.js

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