feat: added the new OS support for NGINX R31

[oliveromahony]

Proposed changes

• Alpine Linux 3.19 added
• FreeBSD 14 added
• Alpine Linux 3.15 removed
• FreeBSD 12 removed

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING document
• I have run make install-tools and have attached any dependency changes to this pull request
• If applicable, I have added tests that prove my fix is effective or that my feature works
• If applicable, I have checked that any relevant tests pass after adding my changes
• If applicable, I have updated any relevant documentation (README.md)
• If applicable, I have tested my cross-platform changes on Ubuntu 22, Redhat 8, SUSE 15 and FreeBSD 13

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (17fe5e9) 66.15% compared to head (0f29a7e) 66.10%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #538      +/-   ##
==========================================
- Coverage   66.15%   66.10%   -0.06%     
==========================================
  Files         118      118              
  Lines       13468    13468              
==========================================
- Hits         8910     8903       -7     
- Misses       3958     3963       +5     
- Partials      600      602       +2     

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