patch 8.2.0376: nasty callback test fails on some systems

Problem:    Nasty callback test fails on some systems.
Solution:   Increase the sleep time.

Author: brammool

src/testdir/test_terminal.vim

@@ -2453,7 +2453,7 @@ func Test_term_nasty_callback()
   call OpenTerms()
 
   call term_sendkeys(g:buf0, "exit\<CR>")
-  sleep 50m
+  sleep 100m
   exe g:buf0 .. 'bwipe'
   set hidden&
 endfunc

src/version.c

@@ -738,6 +738,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    376,
 /**/
     375,
 /**/