Fix GSBotoStorage connection kwargs

[jschneier]

No description provided.

[codecov-io]

Codecov Report

Merging #342 into master will decrease coverage by 0.1%.
The diff coverage is 28.57%.

@@            Coverage Diff             @@
##           master     #342      +/-   ##
==========================================
- Coverage   75.61%   75.51%   -0.11%     
==========================================
  Files          11       11              
  Lines        1542     1556      +14     
==========================================
+ Hits         1166     1175       +9     
- Misses        376      381       +5

Impacted Files	Coverage Δ
storages/backends/gs.py	69.73% <25%> (-2.49%)	⬇️
storages/backends/s3boto.py	87.41% <33.33%> (-0.56%)	⬇️
storages/utils.py	100% <0%> (ø)	⬆️

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