patch 8.1.0530: channel and terminal tests that start a server can be flaky

Problem:    Channel and terminal tests that start a server can be flaky.
Solution:   Add all channel and terminal tests that start a server to the list
            of flaky tests.
diff --git a/src/version.c b/src/version.c
index ebea70f..878891e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -793,6 +793,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    530,
+/**/
     529,
 /**/
     528,