patch 9.1.1990: tests: Test_term_gettty() fails when using conpty on Windows

Problem:  tests: Test_term_gettty() fails when using conpty on Windows,
          CI uses winpty, so this test passes.
Solution: Skip the test Test_term_gettty(). Since conpty communicates
          via anonymous pipes, there is no name that can be obtained
          with term_gettty() (Muraoka Taro)

closes: #18954

Signed-off-by: Muraoka Taro <koron.kaoriya@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/testdir/test_vim9_builtin.vim

@@ -4766,6 +4766,9 @@ def Test_term_gettty()
     CheckFeature terminal
   else
     var buf = g:Run_shell_in_terminal({})
+    if has('win32') && buf->term_getjob()->job_info()['tty_type'] == 'conpty'
+      throw 'Skipped: When using conpty, term_gettty() always returns an empty string.'
+    endif
     term_gettty(buf, true)->assert_notequal('')
     g:StopShellInTerminal(buf)
   endif

src/version.c

@@ -734,6 +734,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1990,
 /**/
     1989,
 /**/