patch 8.2.3131: MS-Windows: ipv6 channel test is very flaky in the GUI

Problem:    MS-Windows: ipv6 channel test is very flaky in the GUI.
Solution:   Skip the test.
diff --git a/src/version.c b/src/version.c
index fb76c39..30db741 100644
--- a/src/version.c
+++ b/src/version.c
@@ -756,6 +756,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3131,
+/**/
     3130,
 /**/
     3129,