Support Elixir 1.18 in GitHub CI

[kianmeng]

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[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.65%. Comparing base (ab86164) to head (7149854).
Report is 6 commits behind head on main.

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Additional details and impacted files

@@             Coverage Diff             @@
##              main     #117      +/-   ##
===========================================
- Coverage   100.00%   98.65%   -1.35%     
===========================================
  Files            2        2              
  Lines          145      149       +4     
===========================================
+ Hits           145      147       +2     
- Misses           0        2       +2     

see 1 file with indirect coverage changes

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[josevalim]

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[kianmeng]

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