Adds Ruby 3.2 to the CI matrix

[petergoldstein]

Updates checkout action version.

I also needed to change a 127.0.0.1 to localhost to get the specs to pass.

[codecov-commenter]

Codecov Report

Merging #543 (5f7bb1e) into master (edbcad3) will not change coverage.
The diff coverage is 100.00%.

❗ Current head 5f7bb1e differs from pull request most recent head d3e074d. Consider uploading reports for the commit d3e074d to get more accurate results

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@@           Coverage Diff           @@
##           master     #543   +/-   ##
=======================================
  Coverage   87.39%   87.39%           
=======================================
  Files          18       18           
  Lines        1269     1269           
=======================================
  Hits         1109     1109           
  Misses        160      160           

Impacted Files	Coverage Δ
lib/mini_profiler/profiler.rb	83.50% <100.00%> (ø)

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[petergoldstein]

@nateberkopec since you're now triaging (I'm a subscriber!), maybe you can get this merged. I just fixed a lint that showed up since I submitted the PR, so it's all green as of today.

[SamSaffron]

oh ... this is nice. Thanks