Fix workflow mutation.

[terabytesoftw]

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

[what-the-diff]

PR Summary

• Updated the Command in Run Infection Step
  The process to execute commands in the "Run infection" stage within the mutation.yml file has been modified. Instead of using -j2, we're now using the --threads=2 flag. This provides an equivalent level of parallel processing, better readability and consistency across different systems.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9fae32a) 99.04% compared to head (ebb7fa3) 99.04%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #323   +/-   ##
=========================================
  Coverage     99.04%   99.04%           
  Complexity      174      174           
=========================================
  Files            13       13           
  Lines           524      524           
=========================================
  Hits            519      519           
  Misses            5        5           

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