Rename sspi dep to sspic

[jborean93]

Renames the sspi dependency to sspic to reflect the name change. This was done to avoid a conflict with pywin32's sspi package that it exports.

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (f202da9) 99.96% compared to head (6bf0262) 99.96%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #70   +/-   ##
=======================================
  Coverage   99.96%   99.96%           
=======================================
  Files          30       30           
  Lines        5357     5357           
=======================================
  Hits         5355     5355           
  Misses          2        2           

Flag	Coverage Δ
	99.96% <100.00%> (ø)
py3.10	99.92% <100.00%> (ø)
py3.11	99.92% <100.00%> (ø)
py3.12.0-rc.1	99.92% <100.00%> (ø)
py3.8	99.92% <100.00%> (ø)
py3.9	99.96% <100.00%> (ø)
x64	99.96% <100.00%> (ø)
x86	95.83% <100.00%> (ø)

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Files	Coverage Δ
src/spnego/_sspi.py	100.00% <100.00%> (ø)

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