FindwxWidgets: Support more wxWidgets versions, including 3.2

Brad Kingrequested to merge
brad.king/cmake:FindwxWidgets-more-versions into master

Backport !7374 (merged) for the 3.24 release branch.

Update the example to use a more recent wxWidgets version.

Use a list with known version numbers when searching for installation directories and wx-config names.

Issue: #21544 (closed)
Backport: release

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