:construction: Updates List of boolean attributes to follow spec

[ekwoka]

This PR simply updates the list of Boolean Attributes to follow updates in the spec, as well as moves the list out of the function and into a set for improved performance (and sorting my alphabet to make updates easier).

The actual attribute changes are

- allowpaymentrequest
+ inert
+ shadowrootclonable
+ shadowrootdelegatesfocus
+ shadowrootserializable

allowpaymentrequest was deprecated a long time ago, so I vote for removal.

Not included is credentialess which is a draft attribute, but is supported by everything except FireFox.

[calebporzio]

great, thanks!