test: skip flaky tests

test/old/testdir/test_perl.vim

@@ -94,6 +94,7 @@ func Test_buffer_Number()
 endfunc
 
 func Test_window_Cursor()
+  throw 'skipped: flaky '
   new
   call setline(1, ['line1', 'line2'])
   perl $curwin->Cursor(2, 3)
@@ -104,7 +105,7 @@ func Test_window_Cursor()
 endfunc
 
 func Test_window_SetHeight()
-  throw 'skipped: very flaky '
+  throw 'skipped: flaky '
   new
   perl $curwin->SetHeight(2)
   call assert_equal(2, winheight(0))

test/unit/eval/typval_spec.lua

@@ -3223,7 +3223,7 @@ describe('typval.c', function()
         end)
       end)
       describe('lnum()', function()
-        itp('works', function()
+        pending('works (skip due to flakiness)', function()
           for _, v in ipairs({
             { lib.VAR_NUMBER, { v_number = 42 }, nil, 42 },
             { lib.VAR_STRING, { v_string = to_cstr('100500') }, nil, 100500 },