patch 8.2.2125: Vim9: leaking memory

Problem:    Vim9: leaking memory.
Solution:   Free the saved 'cpo' value.

src/scriptfile.c

@@ -1492,7 +1492,7 @@ almosttheend:
     if (si->sn_save_cpo != NULL)
     {
 	set_option_value((char_u *)"cpo", 0L, si->sn_save_cpo, 0);
-	si->sn_save_cpo = NULL;
+	CLEAR_POINTER(si->sn_save_cpo);
     }
 
     current_sctx = save_current_sctx;

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2125,
 /**/
     2124,
 /**/