Use the same setup-php version on all tests

[solracsf]

Summary

• Use same version on all tests (no need to run some old versions on some tests)
• This versions ships a fallback mirror for ondrej/php PPA when launchpad is down wich can improve test reliability. See https://github.com/shivammathur/setup-php/releases/tag/2.31.0

TODO

• CI

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)

[joshtrichards]

I wonder if it's worth either:

• using the v2 tag (I get we may not want to let it float to even minor patch version changes to avoid test diffs; though I guess we already have been using inconsistent hashes since we're doing this all manually at the moment)
• go ahead and use a specific 2.x.y version tag and integrate with dependabot

?

Refs:

• https://github.com/shivammathur/setup-php/tree/2.31.0?tab=readme-ov-file#bookmark-versioning
• https://docs.github.com/en/github/administering-a-repository/keeping-your-actions-up-to-date-with-github-dependabot

[solracsf]

To read also: https://blog.rafaelgss.dev/why-you-should-pin-actions-by-commit-hash

[joshtrichards]

Makes sense

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