test: fix coverage

lib/manager/gradle-lite/tokenizer.ts

@@ -113,6 +113,7 @@ function processChars(acc: Token[], token: Token): Token[] {
   const tokenType = token.type;
   const prevToken: Token = acc[acc.length - 1];
   if ([TokenType.Chars, TokenType.EscapedChar].includes(tokenType)) {
+    // istanbul ignore if
     if (prevToken?.type === TokenType.String) {
       prevToken.value += token.value;
     } else {