Update PHPCS rules and packages.

[ryanwelcher]

The PR adds the custom rules from Newspack as referenced here.

@claudiulodro I was wondering if we need the custom sniff for this or if that is just part of the internal framework?

[claudiulodro]

@claudiulodro I was wondering if we need the custom sniff for this or if that is just part of the internal framework?

Probably not super necessary. I'm not sure if the latest official WP sniffs care, but the custom one lets us use short array syntax ([]), not require Yoda conditionals, and other small tweaks like that. I don't think it's a huge deal if people need to use the legacy array syntax or Yoda conditionals. All our sites run on PHP 8.x, so some of the backwards compatibility for old PHP versions isn't needed.

[ryanwelcher]

I'll pull out the custom one in phpSniffs for now