Fix status code logging and use lazy % formatting in logging functions

[hugovk]

Follow on from #68.

[codecov]

Codecov Report

Merging #70 (47541c7) into main (a8254b3) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main      #70   +/-   ##
=======================================
  Coverage   95.75%   95.75%           
=======================================
  Files           8        8           
  Lines         353      353           
=======================================
  Hits          338      338           
  Misses         15       15           

Flag	Coverage Δ
GHA_Ubuntu	95.75% <100.00%> (ø)
GHA_Windows	95.75% <100.00%> (ø)
GHA_macOS	95.75% <100.00%> (ø)

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Impacted Files	Coverage Δ
src/norwegianblue/__init__.py	98.44% <100.00%> (ø)

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