patch 8.2.3534: autoread test is a bit flaky

Problem:    Autoread test is a bit flaky.
Solution:   Wait a brief moment before overwriting the file.
diff --git a/src/testdir/test_stat.vim b/src/testdir/test_stat.vim
index fa61c5c..de4a204 100644
--- a/src/testdir/test_stat.vim
+++ b/src/testdir/test_stat.vim
@@ -104,7 +104,8 @@
   setlocal autoread
   call setline(1, 'foo')
   w!
-  silent !echo bar > Xautoread
+  sleep 10m
+  call writefile(['bar'], 'Xautoread')
   sleep 10m
   checktime
   call assert_equal('bar', trim(getline(1)))
diff --git a/src/version.c b/src/version.c
index b84aef5..6599ae0 100644
--- a/src/version.c
+++ b/src/version.c
@@ -758,6 +758,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3534,
+/**/
     3533,
 /**/
     3532,