Tests/GH Actions: allow for upstream issue which prevented the PHP 8.1 builds from passing
Tests: temporarily skip a test until WP updates the Requests library
This should allow the PHP 8.1 build to pass.
GH Actions: do not allow the PHP 8.1 build to fail anymore
... and test against the highest and lowest support WP version.
Once WP Core ticket https://core.trac.wordpress.org/ticket/54504 has been actioned, the temporary test skipping for the one test can be removed again.
As for the PHP 8.2 tests showing deprecation notices - all of those are related to upstream ticket https://core.trac.wordpress.org/ticket/56034
Rebased the PR and added a second matrix update commit to allow for WP 6.2 and PHP 8.2 having been released.
As the build is now passing, the first commit of this PR (what this PR was about) is no longer needed, so I'll close this PR.
I will open a new PR for the GH Actions matrix updates.