FindGSL: Backport "Improve version extraction regex" to CMake 3.22
Backport !6812 (merged) to the CMake 3.22 branch.
Fixes: #23017 (closed)
Backport: release
Edited by Brad King
Backport !6812 (merged) to the CMake 3.22 branch.
Fixes: #23017 (closed)
Backport: release