R32 operating system support parity

[oliveromahony]

Proposed changes

R32 Operating System Support

Added platforms:

• Alpine Linux 3.20

Deprecated platforms:

• CentOS 7 / RHEL 7 / Oracle Linux 7
• Alpine Linux 3.16
• FreeBSD 12

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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[ADubhlaoich]

LGTM on the docs side!