Fix import for collections Mapping
Fix import for collections Mapping

Mapping and other "abstract base classes" were moved after python 3.3 from collections to collections.abc
Python 3.3 is long gone and a newer version of python won't support this code.
guilhermefelipecgs/godot,josempans/godot,firefly2442/godot,BastiaanOlij/godot,pkowal1982/godot,vnen/godot,firefly2442/godot,Valentactive/godot,Zylann/godot,vkbsb/godot,ZuBsPaCe/godot,Valentactive/godot,akien-mga/godot,vkbsb/godot,vkbsb/godot,BastiaanOlij/godot,josempans/godot,BastiaanOlij/godot,josempans/godot,godotengine/godot,Faless/godot,sanikoyes/godot,akien-mga/godot,firefly2442/godot,ZuBsPaCe/godot,akien-mga/godot,josempans/godot,Shockblast/godot,vkbsb/godot,guilhermefelipecgs/godot,Faless/godot,ZuBsPaCe/godot,guilhermefelipecgs/godot,Faless/godot,pkowal1982/godot,guilhermefelipecgs/godot,guilhermefelipecgs/godot,godotengine/godot,akien-mga/godot,Zylann/godot,ZuBsPaCe/godot,godotengine/godot,vkbsb/godot,Valentactive/godot,vkbsb/godot,firefly2442/godot,Shockblast/godot,Faless/godot,pkowal1982/godot,Shockblast/godot,Zylann/godot,BastiaanOlij/godot,BastiaanOlij/godot,vnen/godot,pkowal1982/godot,godotengine/godot,guilhermefelipecgs/godot,josempans/godot,Valentactive/godot,vnen/godot,Shockblast/godot,josempans/godot,Valentactive/godot,firefly2442/godot,sanikoyes/godot,Zylann/godot,sanikoyes/godot,akien-mga/godot,pkowal1982/godot,vnen/godot,akien-mga/godot,ZuBsPaCe/godot,ZuBsPaCe/godot,Zylann/godot,pkowal1982/godot,firefly2442/godot,guilhermefelipecgs/godot,ZuBsPaCe/godot,firefly2442/godot,sanikoyes/godot,vkbsb/godot,Faless/godot,Zylann/godot,sanikoyes/godot,Valentactive/godot,sanikoyes/godot,Faless/godot,firefly2442/godot,guilhermefelipecgs/godot,Valentactive/godot,godotengine/godot,Shockblast/godot,vnen/godot,sanikoyes/godot,BastiaanOlij/godot,Shockblast/godot,sanikoyes/godot,BastiaanOlij/godot,BastiaanOlij/godot,ZuBsPaCe/godot,akien-mga/godot,Zylann/godot,godotengine/godot,godotengine/godot,godotengine/godot,pkowal1982/godot,Shockblast/godot,vnen/godot,vnen/godot,pkowal1982/godot,akien-mga/godot,vkbsb/godot,Valentactive/godot,Faless/godot,josempans/godot,josempans/godot,Faless/godot,Shockblast/godot,vnen/godot,Zylann/godot