Fix deprecation warning in PHP 8.4

[robertvansteen]

This fixes deprecation warning in PHP 8.4

Deprecated: RobinIngelbrecht\PHPUnitCoverageTools\MinCoverage\MinCoverageResult::mapFromRulesAndMetrics(): Implicitly marking parameter $metricTotal as nullable is deprecated, the explicit nullable type must be used instead

[robiningelbrecht]

@robertvansteen thanks for you contribution!

Would following work as well?

?CoverageMetric $metricTotal

[robertvansteen]

@robertvansteen thanks for you contribution!

Would following work as well?

?CoverageMetric $metricTotal

That would also work :)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 0.00%. Comparing base (a4d5e78) to head (e582c45).
Report is 5 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##             master   #18       +/-   ##
==========================================
- Coverage     99.39%     0   -99.40%     
==========================================
  Files             9     0        -9     
  Lines           330     0      -330     
==========================================
- Hits            328     0      -328     
+ Misses            2     0        -2     

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