Use binding requests as keepalives

[LVala]

Close #49

Also, bumps deps as current credo failed with Elixir 1.17.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 5 lines in your changes missing coverage. Please review.

Project coverage is 80.45%. Comparing base (2c89826) to head (680468a).

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #51      +/-   ##
==========================================
+ Coverage   79.94%   80.45%   +0.51%     
==========================================
  Files          25       25              
  Lines        1436     1443       +7     
==========================================
+ Hits         1148     1161      +13     
+ Misses        288      282       -6     

Files	Coverage Δ
lib/ex_ice/priv/candidate_pair.ex	63.63% <ø> (ø)
lib/ex_ice/priv/ice_agent.ex	84.41% <50.00%> (+0.82%)	⬆️

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