Quickbooks integration: Sunset of older API versions

[dd32]

Describe the bug

Quickbooks is sunsetting older versions of it's API later this year, WordCamp.org appears to be using one of those versions:

https://blogs.intuit.com/2025/01/21/changes-to-our-accounting-api-that-may-impact-your-application/

Beginning August 1, 2025, we will be deprecating support for minor versions 1–74. All API requests to the Accounting API will use the minor version 75 by default and previous minor versions will be ignored.

wordcamp.org/public_html/wp-content/plugins/wordcamp-qbo/wordcamp-qbo.php

Lines 249 to 252 in f609590

	$args = array(
	'query' => 'SELECT * FROM Class MAXRESULTS 1000',
	'minorversion' => 4,
	);

I haven't reviewed the rest of the codebase, only performed a search for minorversion.