CLI-1423: PHPUnit 10

[danepowell]

Motivation

Fixes CLI-1423

Proposed changes

Paratest dropped support for PHP 8.1 so we can't upgrade past 7.3.1. Unfortunately 7.3.1 is incompatible with newer versions of PHPUnit so we have to pin it until PHP 8.1 is EOL 😢

paratestphp/paratest#890

Alternatives considered

Testing steps

1. Follow the contribution guide to set up your development environment or download a pre-built acli.phar for this PR.
2. Clear the kernel cache to pick up new and changed commands: ./bin/acli ckc
3. (add specific steps for this pr)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.55%. Comparing base (b67b4c8) to head (cc66c5f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1820      +/-   ##
============================================
- Coverage     92.76%   92.55%   -0.22%     
- Complexity     1822     1830       +8     
============================================
  Files           122      123       +1     
  Lines          6913     6929      +16     
============================================
  Hits           6413     6413              
- Misses          500      516      +16     

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[github-actions]

Try the dev build for this PR: https://acquia-cli.s3.amazonaws.com/build/pr/1820/acli.phar

curl -OL https://acquia-cli.s3.amazonaws.com/build/pr/1820/acli.phar
chmod +x acli.phar