Setting HostDocumentSyncVersion to a magic number

With magic number -5 Razor Language Server would
know that the response is coming from VS Code so it
would ignore discarding response due to out of sync
error altogether.

Author: maryamariyan

src/razor/src/semantic/semanticTokensRangeHandler.ts

@@ -18,7 +18,7 @@ export class SemanticTokensRangeHandler {
     > = new RequestType(SemanticTokensRangeHandler.getSemanticTokensRangeEndpoint);
     private emptySemanticTokensResponse: ProvideSemanticTokensResponse = new ProvideSemanticTokensResponse(
         new Array<Array<number>>(),
-        -1
+        -5
     );
 
     constructor(private readonly serverClient: RazorLanguageServerClient) {}