vlc: catch errors when instanciating vlc in is_available

[odrling]

This would make the tests fail on a system without VLC installed. Detecting it in is_available skips the tests.

For reference this is the error I get:

Traceback (most recent call last):
  File "/home/odrling/git/misc/dakara-player/src/dakara_player/media_player/vlc.py", line 94, in is_available
    return vlc is not None and vlc.Instance() is not None
                               ^^^^^^^^^^^^^^
  File "/home/odrling/git/misc/dakara-player/.direnv/python-3.12/lib/python3.12/site-packages/vlc.py", line 1838, in __new__
    return libvlc_new(len(args), args)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/odrling/git/misc/dakara-player/.direnv/python-3.12/lib/python3.12/site-packages/vlc.py", line 5014, in libvlc_new
    _Cfunction('libvlc_new', ((1,), (1,),), class_result(Instance),
  File "/home/odrling/git/misc/dakara-player/.direnv/python-3.12/lib/python3.12/site-packages/vlc.py", line 302, in _Cfunction
    raise NameError('no function %r' % (name,))
NameError: no function 'libvlc_new'

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.04%. Comparing base (f6e52f0) to head (611323a).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #124   +/-   ##
========================================
  Coverage    99.04%   99.04%           
========================================
  Files           16       16           
  Lines         1362     1366    +4     
========================================
+ Hits          1349     1353    +4     
  Misses          13       13           

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