Test against Action Pack 8.0

[tagliala]

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 98.92%. Comparing base (4a6410e) to head (b9dd56e). Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #942   +/-   ##
=======================================
  Coverage   98.92%   98.92%           
=======================================
  Files          14       14           
  Lines         557      557           
=======================================
  Hits          551      551           
  Misses          6        6           

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[tagliala]

Done, same consideration about Rails 6.1 (will do that in a new PR with a different branch and a change to gemspec)