Revert "Increment version number from 4.2 to 4.3"
Revert "Increment version number from 4.2 to 4.3"

This reverts commit 202d8b98fa5dbf16bb96cf148fef606dab934bf7.

json-api-dotnet/JsonApiDotNetCore,Research-Institute/json-api-dotnet-core,Research-Institute/json-api-dotnet-core