patch 9.0.0574: timer garbage collect test hangs on Mac M1

Problem:    Timer garbage collect test hangs on Mac M1.
Solution:   Properly check for Mac M1 and skip the test.
diff --git a/src/testdir/test_timers.vim b/src/testdir/test_timers.vim
index 98df6ff..f97808c 100644
--- a/src/testdir/test_timers.vim
+++ b/src/testdir/test_timers.vim
@@ -381,7 +381,12 @@
 " vgetc().
 func Test_nocatch_timer_garbage_collect()
   " FIXME: why does this fail only on MacOS M1?
-  CheckNotMacM1
+  try 
+    CheckNotMacM1
+  catch /Skipped/
+    let g:skipped_reason = v:exception
+    return
+  endtry
 
   " 'uptimetime. must be bigger than the timer timeout
   set ut=200
diff --git a/src/version.c b/src/version.c
index 4428687..5057877 100644
--- a/src/version.c
+++ b/src/version.c
@@ -700,6 +700,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    574,
+/**/
     573,
 /**/
     572,