patch 8.2.2092: Vim9: unpredictable errors for script tests

Problem:    Vim9: unpredictable errors for script tests.
Solution:   Use a different script file name for each run.
diff --git a/src/testdir/test_quickfix.vim b/src/testdir/test_quickfix.vim
index 78fd6c9..d89508f 100644
--- a/src/testdir/test_quickfix.vim
+++ b/src/testdir/test_quickfix.vim
@@ -5253,7 +5253,7 @@
   call delete('XquickfixFails')
 endfunc
 
-" Test for updating the quickfix buffer whenever the assocaited quickfix list
+" Test for updating the quickfix buffer whenever the associated quickfix list
 " is changed.
 func Xqfbuf_update(cchar)
   call s:setup_commands(a:cchar)