runtime(vim): Update base-syntax, match Vim9 function calls after "|"

Match Vim9 function calls after ex-bar.  These are also currently
matched but invalid syntax for legacy script.

fixes: #16721
closes: #16747

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

runtime/syntax/testdir/input/vim9_function_calls.vim

@@ -0,0 +1,18 @@
+vim9script
+
+# Vim9 function calls
+
+clearmatches()
+:call clearmatches()
+echo "Foo" | clearmatches()
+
+
+# Issue 16721 (vimscript highlight of builtin function after |)
+
+&directory = $'{$MYVIMDIR}/.data/swap/'
+&backupdir = $'{$MYVIMDIR}/.data/backup//'
+&undodir = $'{$MYVIMDIR}/.data/undo//'
+if !isdirectory(&undodir)   | mkdir(&undodir, "p")   | endif
+if !isdirectory(&backupdir) | mkdir(&backupdir, "p") | endif
+if !isdirectory(&directory) | mkdir(&directory, "p") | endif
+