Fix logging.warning call in SS

[maxkossek]

Use parametrized formatting of logging module to prevent format error.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 72.70%. Comparing base (61de262) to head (5a0907f).

Files with missing lines	Patch %	Lines
ogcore/SS.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1064   +/-   ##
=======================================
  Coverage   72.70%   72.70%           
=======================================
  Files          21       21           
  Lines        5111     5111           
=======================================
  Hits         3716     3716           
  Misses       1395     1395           

Flag	Coverage Δ
unittests	72.70% <0.00%> (ø)

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Files with missing lines	Coverage Δ
ogcore/SS.py	73.42% <0.00%> (ø)

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[jdebacker]

Thanks for the PR @maxkossek. Merging.