patch 8.1.1854: now another timer test is flaky

Problem:    Now another timer test is flaky.
Solution:   Add test to list of flaky tests.
diff --git a/src/testdir/runtest.vim b/src/testdir/runtest.vim
index fe02d88..7530bb9 100644
--- a/src/testdir/runtest.vim
+++ b/src/testdir/runtest.vim
@@ -336,6 +336,7 @@
       \ 'Test_repeat_many()',
       \ 'Test_repeat_three()',
       \ 'Test_server_crash()',
+      \ 'Test_stop_all_in_callback()',
       \ 'Test_terminal_ansicolors_default()',
       \ 'Test_terminal_ansicolors_func()',
       \ 'Test_terminal_ansicolors_global()',
diff --git a/src/version.c b/src/version.c
index 38290c6..e497399 100644
--- a/src/version.c
+++ b/src/version.c
@@ -770,6 +770,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1854,
+/**/
     1853,
 /**/
     1852,