Add Malta for linkedin country support

[AntGH]

Add Malta for LinkedIn and fix an error

Traceback:
Traceback (most recent call last):
  File "/home/user/.asdf/installs/python/3.12.6/lib/python3.12/site-packages/jobspy/scrapers/linkedin/__init__.py", line 147, in scrape
    job_post = self._process_job(job_card, job_id, fetch_desc)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user/.asdf/installs/python/3.12.6/lib/python3.12/site-packages/jobspy/scrapers/linkedin/__init__.py", line 194, in _process_job
    location = self._get_location(metadata_card)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user/.asdf/installs/python/3.12.6/lib/python3.12/site-packages/jobspy/scrapers/linkedin/__init__.py", line 303, in _get_locatio
n
    country = Country.from_string(country)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/user/.asdf/installs/python/3.12.6/lib/python3.12/site-packages/jobspy/jobs/__init__.py", line 165, in from_string
    raise ValueError(
ValueError: Invalid country string: 'malta'. Valid countries are: <snip>