fix(createVariableNameGenerator): variable count

Author: ardatan

.changeset/calm-cycles-flow.md

@@ -0,0 +1,5 @@
+---
+'@graphql-tools/utils': patch
+---
+
+Fix the regression on var counting

packages/utils/src/updateArgument.ts

@@ -57,7 +57,8 @@ export function createVariableNameGenerator(
   return (argName: string): string => {
     let varName: string;
     do {
-      varName = varCounter === 0 ? argName : `_v${(varCounter++).toString()}_${argName}`;
+      varName = varCounter === 0 ? argName : `_v${varCounter.toString()}_${argName}`;
+      varCounter++;
     } while (varName in variableDefinitionMap);
     return varName;
   };