patch 8.2.3156: Vim9: term_getansicolors() test fails without +termguicolors

Problem:    Vim9: term_getansicolors() test fails without +termguicolors.
Solution:   Add a check for the feature. (Dominique Pellé, closes #8555)
diff --git a/src/version.c b/src/version.c
index f2f229f..c2314cd 100644
--- a/src/version.c
+++ b/src/version.c
@@ -756,6 +756,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3156,
+/**/
     3155,
 /**/
     3154,