patch 8.2.3187: Vim9: popup timer callback is not compiled

Problem:    Vim9: popup timer callback is not compiled.
Solution:   Compile the callback when creating the timer.
diff --git a/src/version.c b/src/version.c
index 0710ce0..64997fd 100644
--- a/src/version.c
+++ b/src/version.c
@@ -756,6 +756,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3187,
+/**/
     3186,
 /**/
     3185,