[Pullquote] cite style defined in theme.json not applying

[justintadlock]

The nested cite styles in theme.json, specifically for color, is broken when using Gutenberg 18.1 (WP 6.6). This PR reduces the specificity of the global styles selector, wrapping everything in :where():

• Try reducing specificity of global styles selectors only. WordPress/gutenberg#60106

This change causes the Pullquote's cite style nested in .wp-block-pullquote to inherit the color of its parent: https://github.com/WordPress/gutenberg/blob/trunk/packages/block-library/src/pullquote/style.scss

Previously, this was a non-issue because the theme.json-defined color would overrule it. Now, the stylesheet wins out. See:

• Theme.json styles not overriding core inline block styles WordPress/gutenberg#65329