patch 8.2.0266: terminal in popup test sometimes fails on Mac

Problem:    Terminal in popup test sometimes fails on Mac.
Solution:   Add a short delay.

src/testdir/test_terminal.vim

@@ -2353,6 +2353,7 @@ func Test_terminal_in_popup()
 	\ ]
   call writefile(lines, 'XtermPopup')
   let buf = RunVimInTerminal('-S XtermPopup', #{rows: 15})
+  call term_wait(buf, 100)
   call term_sendkeys(buf, ":\<CR>")
   call VerifyScreenDump(buf, 'Test_terminal_popup_1', {})
 

src/version.c

@@ -742,6 +742,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    266,
 /**/
     265,
 /**/