patch 8.2.2220: Vim9: memory leak when parsing nested parenthesis

Problem:    Vim9: memory leak when parsing nested parenthesis.
Solution:   Clear newargs.

src/userfunc.c

@@ -574,6 +574,7 @@ get_lambda_tv(
     {
 	if (types_optional)
 	    ga_clear_strings(&argtypes);
+	ga_clear_strings(&newargs);
 	return white_error ? FAIL : NOTDONE;
     }
     *arg = s;

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2220,
 /**/
     2219,
 /**/