Update qwt to 6.3.0

[email protected] (A. Maitland Bottoms) Sun, 23 Mar 2025 14:48:43 -0400

Newsgroups	gmane.linux.debian.user.kde
Message-ID	<[email protected]>

I've made a merge request on salsa.
It would sure be nice to have a qwt to go with Qt6 in Trixie.

-Maitland

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