fix: deprecate possibly unmaintained ipify

[favonia]

Closes #269.

[codecov]

Codecov Report

Merging #270 (3027012) into main (4c68907) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #270      +/-   ##
==========================================
+ Coverage   85.35%   85.39%   +0.03%     
==========================================
  Files          29       29              
  Lines        1946     1951       +5     
==========================================
+ Hits         1661     1666       +5     
  Misses        274      274              
  Partials       11       11              

Flag	Coverage Δ
unittests	85.39% <100.00%> (+0.03%)	⬆️

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Impacted Files	Coverage Δ
internal/config/env.go	98.61% <100.00%> (+0.03%)	⬆️

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