json_schema.py: If schema has an array with no items key, the pattern is invalid

[lapp0]

Describe the issue as clearly as possible:

In json_schema.py, if the below line is reached, the pattern is illegal.

https://github.com/outlines-dev/outlines/blob/main/outlines/fsm/json_schema.py#L299

In short, there are 5 right-paren, and 4 left-paren

Steps/code to reproduce the bug:

>>> from outlines.fsm.json_schema import build_regex_from_schema
>>> import interegular
>>> pattern = build_regex_from_schema("""{"type": "array"}""")
>>> interegular.parse_pattern(pattern)
Traceback (most recent call last):
  File "/home/andrew/p/outlines/.myenv/lib/python3.11/site-packages/interegular/patterns.py", line 486, in parse
    return super(_ParsePattern, self).parse()
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/andrew/p/outlines/.myenv/lib/python3.11/site-packages/interegular/utils/simple_parser.py", line 63, in parse
    raise NoMatch(self.data, max(self._expected), self._expected[max(self._expected)])
interegular.utils.simple_parser.NoMatch: Can not match at index 269. Got ')?[\\n', expected any of ['?', '(', '[', '\\', '.', '$', '^', "<Any 1 except ('^', '+', ')', '.', '*', '?', '(', '|', '$', '[', '\\\\')>", '|'].
Context(data[-10:+10]): '\\)*")){0,})?[\\n ]*\\]'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/andrew/p/outlines/.myenv/lib/python3.11/site-packages/interegular/patterns.py", line 730, in parse_pattern
    out = p.parse()
          ^^^^^^^^^
  File "/home/andrew/p/outlines/.myenv/lib/python3.11/site-packages/interegular/utils/simple_parser.py", line 38, in w
    return m(self, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/andrew/p/outlines/.myenv/lib/python3.11/site-packages/interegular/patterns.py", line 488, in parse
    raise InvalidSyntax
interegular.patterns.InvalidSyntax

Expected result:

Successfully compiled pattern

Error message:

No response

Outlines/Python version information:

Version information

``` outlines==6f655ca8f00d6ea42c72eb699d97c78a10a826ab ```

Context for the issue:

No response