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.

Author: brammool

src/testdir/test_channel.vim

@@ -252,6 +252,12 @@ endfunc
 
 func Test_communicate_ipv6()
   CheckIPv6
+
+  " FIXME: this test is very flaky on MS-Windows with the GUI
+  if has('gui_running') && has('win32')
+    throw 'Skipped: test is very flaky with MS-Windows in GUI'
+  endif
+
   call Test_communicate()
 endfunc
 

src/version.c

@@ -755,6 +755,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3131,
 /**/
     3130,
 /**/