patch 8.2.3772: timer info test fails on slow machine

Problem:    Timer info test fails on slow machine.
Solution:   Use WaitForAssert().
diff --git a/src/testdir/test_timers.vim b/src/testdir/test_timers.vim
index c833dd8..790b7b0 100644
--- a/src/testdir/test_timers.vim
+++ b/src/testdir/test_timers.vim
@@ -121,8 +121,7 @@
   " check repeat count inside the callback
   let g:timer_repeat = []
   let tid = timer_start(10, {tid -> execute("call add(g:timer_repeat, timer_info(tid)[0].repeat)")}, #{repeat: 3})
-  sleep 100m
-  call assert_equal([2, 1, 0], g:timer_repeat)
+  call WaitForAssert({-> assert_equal([2, 1, 0], g:timer_repeat)})
   unlet g:timer_repeat
 endfunc
 
diff --git a/src/version.c b/src/version.c
index 9b927f2..a598b6b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -754,6 +754,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3772,
+/**/
     3771,
 /**/
     3770,