Make use of @final, Final and Literal
#3753
Merged
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Closes #3735
ClassVartoFinalfor all constants@finaldecorator forBase{UpdateProcessor, Request}Literalfor thehttp_versionargument ofHTTPXRequest. Otherwise,Literalis not used due to Literal of enum values python/typing#781If there are more places, where
@finalorLiteralare useful, please do point them out :)