ThirdParty/QtTesting/vtkqttesting: Update for warning fixes
- Mathieu Westphal (Kitware): fix_warnings (qttesting!78 (merged))
- Nicolas Vuaille: RemoveDebugStatement (qttesting!77 (merged))
- Ben Boeckel: clang-format-9 (qttesting!76 (merged))
- Nicolas Vuaille: AddCI (qttesting!75 (merged))