patch 8.2.4069: Vim9: import test fails on MS-Windows

Problem:    Vim9: import test fails on MS-Windows.
Solution:   Ignore case.  Adjust test to avoid name that only differs in case.
diff --git a/src/testdir/test_vim9_import.vim b/src/testdir/test_vim9_import.vim
index d43012c..bfc99d5 100644
--- a/src/testdir/test_vim9_import.vim
+++ b/src/testdir/test_vim9_import.vim
@@ -1203,12 +1203,12 @@
        g:result = 'other'
      enddef
   END
-  writefile(lines, 'Xdir/autoload/other.vim')
+  writefile(lines, 'Xdir/autoload/another.vim')
 
   lines =<< trim END
       vim9script
-      import autoload 'other.vim'
-      call other.Getother()
+      import autoload 'another.vim'
+      call another.Getother()
       assert_equal('other', g:result)
   END
   CheckScriptSuccess(lines)