coreui / coreui-pro / 30960556007

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chore!: raise the Firefox floor to 129, the version our CSS actually needs (#697)

The floor said Firefox 121, set by :has(). Two features have arrived since
that line was written and both sit above it: @starting-style with
transition-behavior: allow-discrete, which the Menu's entry animation uses
(Firefox 129), and @property (128).

@property is the one that matters. Its nine registrations exist to declare
inherits: false, which is what stops a colour or opacity utility on a
container tinting everything nested inside it. Below 128 the registrations
are ignored and that bug is live — so the old floor was not merely
optimistic, it promised support for browsers where a documented behaviour
does not hold.

Safari, iOS and Chrome do not move: @starting-style landed in Safari 17.5,
which is exactly where light-dark() already put that floor, and Chrome
needed 117 against light-dark()'s 123.

Coverage 87.06% -> 86.47%. Upstream Bootstrap v6 sits at Chrome 130 /
Firefox 132 / Safari 18, so this stays more permissive than theirs.

Versions are from MDN's browser-compat-data. caniuse does not track any of
these three features, so `browserslist "supports …"` cannot answer for
them — worth knowing before the next time someone checks.

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