base: 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

Author: RytoEX

CMakeLists.txt

@@ -1,6 +1,6 @@
 cmake_minimum_required(VERSION 3.28...3.30)
 
-set(obs-websocket_VERSION 5.5.4)
+set(obs-websocket_VERSION 5.6.0)
 set(OBS_WEBSOCKET_RPC_VERSION 1)
 
 include(cmake/obs-websocket-api.cmake)