#116 - Add PHP 8.1 to unix builds matrix

[Jeckerson]

Hello!

• Type: new feature

In raising this pull request, I confirm the following:

• I have read and understood the Contributing Guidelines
• I have checked that another pull request for this purpose does not exist.
• I wrote some tests for this PR.

Thanks

[codecov]

Codecov Report

Merging #119 (eee7652) into development (d0005fb) will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           development     #119   +/-   ##
============================================
  Coverage        75.79%   75.79%           
============================================
  Files                5        5           
  Lines             2954     2954           
============================================
  Hits              2239     2239           
  Misses             715      715           

Flag	Coverage Δ
unittests	75.79% <ø> (ø)

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