patch 8.2.3514: autoread test with nano second time sometimes fails

Problem:    Autoread test with nano second time sometimes fails.
Solution:   Mark the test as being flaky.
diff --git a/src/version.c b/src/version.c
index d6b4c88..f7ebc70 100644
--- a/src/version.c
+++ b/src/version.c
@@ -758,6 +758,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3514,
+/**/
     3513,
 /**/
     3512,