providers/scim: correctly handle 404 by re-creating object

[BeryJu]

#5396

[codecov]

Codecov Report

Patch coverage: 70.00% and project coverage change: -0.01 ⚠️

Comparison is base (0166346) 92.64% compared to head (b8cb66f) 92.62%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5405      +/-   ##
==========================================
- Coverage   92.64%   92.62%   -0.01%     
==========================================
  Files         506      506              
  Lines       25917    25930      +13     
==========================================
+ Hits        24009    24016       +7     
- Misses       1908     1914       +6     

Flag	Coverage Δ
e2e	51.87% <25.00%> (-<0.01%)	⬇️
integration	26.28% <25.00%> (-0.05%)	⬇️
unit	89.51% <70.00%> (-0.01%)	⬇️

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Impacted Files	Coverage Δ
authentik/providers/scim/clients/base.py	88.47% <33.34%> (-3.53%)	⬇️
authentik/providers/scim/clients/user.py	77.97% <66.67%> (-2.03%)	⬇️
authentik/providers/scim/clients/group.py	77.09% <80.00%> (-0.69%)	⬇️
authentik/providers/scim/clients/exceptions.py	100.00% <100.00%> (ø)

... and 7 files with indirect coverage changes

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