Fix workflow mutation.

[terabytesoftw]

Q	A
Is bugfix?	✔️
New feature?	❌
Breaks BC?	❌

[what-the-diff]

PR Summary

• Update to Workflow Configuration
  The automated workflow configuration, specifically the mutation.yml file, was changed to adjust to current needs.
• Upgrade to Latest PHP Version
  The version of PHP we're using was updated. We were previously using PHP 8.0, but with this change we're now using PHP 8.1, which will allow us to incorporate the latest PHP features and improvements.
• Improvement in 'Infection' Running Step
  An update was made to the command used to run a quality assurance tool called 'Infection'. Inclusion of --threads=2 flag should help increase the speed and efficiency of how this tool runs.
• Use of STRYKER_DASHBOARD_API_KEY
  The STRYKER_DASHBOARD_API_KEY is now being referenced in the run command. This would help in streamlining use of mutation testing dashboard, if you are using one.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (36aa01a) 98.42% compared to head (c8e8d1e) 98.42%.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #291   +/-   ##
=========================================
  Coverage     98.42%   98.42%           
  Complexity      329      329           
=========================================
  Files            19       19           
  Lines          1015     1015           
=========================================
  Hits            999      999           
  Misses           16       16           

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