patch 8.2.0548: Vim9: not all possible func type errors tested

Problem:    Vim9: not all possible func type errors tested.
Solution:   Add more tests.
diff --git a/src/version.c b/src/version.c
index 22b00e4..d7d504b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -739,6 +739,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    548,
+/**/
     547,
 /**/
     546,