obs-websocket: Update version to 5.6.0
New Features:
- Added `obsStudioVersion` field to Identify message [tt2468]
- Added `inputKindCaps` field to input list array [tt2468]
- Added `inputKindCaps` to `CreateInput` event [tt2468]
- Added input deinterlace mode/field order requests [tt2468]
Enhancements:
- Added nlohmann type converters for source deinterlacing [tt2468]
Bug Fixes:
- Avoided unnecessary volumemeters object copy [tt2468]
Other Notes:
- Updated documentation
Ryan Foster