patch 8.1.0600: channel test is flaky

Problem:    Channel test is flaky.
Solution:   Add test to list of flaky tests.
diff --git a/src/version.c b/src/version.c
index 0231cc8..a485b28 100644
--- a/src/version.c
+++ b/src/version.c
@@ -800,6 +800,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    600,
+/**/
     599,
 /**/
     598,