patch 8.2.3712: cannot use Vim9 lambda for 'tagfunc'

Problem:    Cannot use Vim9 lambda for 'tagfunc'.
Solution:   Make it work, add more tests. (Yegappan Lakshmanan, closes #9250)
diff --git a/src/version.c b/src/version.c
index 4890e2c..d6f409e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -754,6 +754,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3712,
+/**/
     3711,
 /**/
     3710,