patch 8.1.0965: search test fails

Problem:    Search test fails.
Solution:   Wait a bit longer for the 'ambiwidth' redraw.

src/testdir/dumps/Test_incsearch_change_01.dump

@@ -1,5 +1,5 @@
 |o+0&#ffffff0|n|e| @66
-|x+1&&| +0&&@68
+|x| @68
 |t|h|r|e@1| @64
 |~+0#4040ff13&| @68
 |~| @68

src/testdir/test_search.vim

@@ -994,7 +994,7 @@ func Test_incsearch_with_change()
   let buf = RunVimInTerminal('-S Xis_change_script', {'rows': 9, 'cols': 70})
   " Give Vim a chance to redraw to get rid of the spaces in line 2 caused by
   " the 'ambiwidth' check.
-  sleep 100m
+  sleep 300m
 
   " Highlight X, it will be deleted by the timer callback.
   call term_sendkeys(buf, ':%s/X')

src/version.c

@@ -779,6 +779,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    965,
 /**/
     964,
 /**/