[FIX] web: add ar-sy to arab numbering system

To Reproduce
============
- change language to Arabic Syria
- go to any form that has a Date field and try to change the date
the Date won't change

Problem
=======
the default numbering system of Arabic Syria is not defined so we take the default one
which is `latn`, when parsing dates using this numbering system we got a parsing error
because `latn` is not compatible with Arabic Date.

Solution
========
Numbers in Arabic Syria have the same format as the numbers in Arabic (Default one),
so we add Arabic Syria to the pattern.

opw-3081285

closes odoo/odoo#108247

X-original-commit: 8c50eb447da41a3ae0186d99972dd7e56d12cd23
Signed-off-by: Julien Mougenot (jum) <jum@odoo.com>
Signed-off-by: abla001 <abla@odoo.com>

addons/web/static/src/core/l10n/localization_service.js

@@ -11,7 +11,7 @@ const { Settings } = luxon;
 
 /** @type {[RegExp, string][]} */
 const NUMBERING_SYSTEMS = [
-    [/^ar-(sa|001)$/i, "arab"],
+    [/^ar-(sa|sy|001)$/i, "arab"],
     [/^bn/i, "beng"],
     [/^bo/i, "tibt"],
     // [/^fa/i, "Farsi (Persian)"], // No numberingSystem found in Intl