Update LanguageServerProtocol to 5.3.0

Author: matarillo

server/SampleServer/SampleServer.csproj

@@ -53,7 +53,7 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="LanguageServerProtocol">
-      <Version>5.2.0</Version>
+      <Version>5.3.0</Version>
     </PackageReference>
     <PackageReference Include="System.Console">
       <Version>4.3.0</Version>