runtime(vim): Update base-syntax, match tuples

Tuples were introduced in commit 9cb865e.  See PR #16776.

fixes: #16965
closes: #16935

Signed-off-by: Doug Kearns <dougkearns@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

runtime/syntax/testdir/input/vim_expr.vim

@@ -173,6 +173,21 @@ echo #{
 " match as keys not scope dictionaries
 echo #{ b: 42, w: 42, t: 42, g: 42, l: 42, s: 42, a: 42, v: 42  }
 
+" Tuple
+
+echo ()
+echo (42,)
+echo ((11, 12), (21, 22), (31, 32))
+echo (1,
+      \ 2,
+      \ 3,
+      \ 4
+      \)
+echo (1, 'two', 1 + 2, "fo" .. "ur")
+
+echo foo + (42, 87)
+echo (42, 87) + foo
+
 " Register
 
 echo @"