Fix BHI1007 errors in NLua

"Don't use target-typed new for throw expressions"
doesn't include rebuilt assembly because it should be identical IL
modulo timestamps
one of these was `Exception` and got stripped, one was checked-in as
implicitly-typed
see 5fd840e14 and 29c15adbb

ExternalProjects/NLua/src/Native/LuaNativeMethodLoader.cs

@@ -282,7 +282,7 @@ namespace NLua.Native
 				return nativeMethods;
 			}
 
-			throw new("Could not load native lua methods");
+			throw new Exception("Could not load native lua methods");
 		});
 
 		internal static LuaNativeMethods GetNativeMethods()

ExternalProjects/NLua/src/ObjectTranslatorPool.cs

@@ -25,7 +25,7 @@ namespace NLua
 				var main = luaState.MainThread;
 				if (!translators.TryGetValue(main, out translator))
 				{
-					throw new("Invalid luaState, couldn't find ObjectTranslator");
+					throw new Exception("Invalid luaState, couldn't find ObjectTranslator");
 				}
 			}