tox4: Require tox 4.0.0b2 or later

[ymyzk]

Description

Require tox 4.0.0b2 or later. #59

Expected Behavior

No regressions.

[codecov-commenter]

Codecov Report

Base: 77.34% // Head: 77.34% // No change to project coverage 👍

Coverage data is based on head (928371f) compared to base (6aa0c18).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             tox4     #129   +/-   ##
=======================================
  Coverage   77.34%   77.34%           
=======================================
  Files           2        2           
  Lines         128      128           
  Branches       33       32    -1     
=======================================
  Hits           99       99           
  Misses         15       15           
  Partials       14       14           

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