providers/scim: ensure scim group member isn't None

[BeryJu]

closes #5385

[codecov]

Codecov Report

Patch coverage: 60.00% and project coverage change: -0.03 ⚠️

Comparison is base (b058906) 92.39% compared to head (21e86ff) 92.35%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5391      +/-   ##
==========================================
- Coverage   92.39%   92.35%   -0.03%     
==========================================
  Files         506      506              
  Lines       25913    25917       +4     
==========================================
- Hits        23939    23934       -5     
- Misses       1974     1983       +9     

Flag	Coverage Δ
e2e	51.70% <20.00%> (-0.02%)	⬇️
integration	26.29% <20.00%> (-0.04%)	⬇️
unit	89.53% <60.00%> (-<0.01%)	⬇️

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Impacted Files	Coverage Δ
authentik/providers/scim/clients/group.py	77.78% <50.00%> (-0.38%)	⬇️
authentik/lib/sentry.py	92.96% <100.00%> (+0.11%)	⬆️

... and 7 files with indirect coverage changes

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