Keep FastDateParser numeric parse from throwing on int overflow

[alhudz]

Repro: parse an untrusted date whose numeric field is a digit run that overflows int, e.g. FastDateFormat.getInstance("yyyy").parse("99999999999"), or getInstance("yyyy").parseObject("99999999999", new ParsePosition(0)).
Cause: NumberStrategy.parse scans an unbounded run of digits for a trailing or standalone numeric field (its maxWidth is 0) and passes the whole run to Integer.parseInt. A run that overflows int makes parseInt throw NumberFormatException, which escapes uncaught, so parse(String) throws NumberFormatException rather than the declared ParseException, and the ParsePosition overloads (parse, parseObject) throw instead of returning null with an error index as the java.text.Format contract requires.
Fix: catch the overflow inside NumberStrategy.parse and signal a parse failure the same way the existing empty-digit branch already does (setErrorIndex then return false), so the field is simply unparseable instead of crashing the parser. Valid inputs are unchanged and it is the only Integer.parseInt in the class.