CI pipeline error: PHP 7.0 dependency icu4c@78 no longer available in Homebrew

[jamisonbryant]

The CI workflow is failing when testing PHP 7.0 because the shivammathur/php tap's php@7.0 formula depends on icu4c@78, which is no longer available in Homebrew core (only 74-77 remain).

Sources:

• macOS 15.0 Sequoia Apache Setup: Multiple PHP Versions
• php@7.4 no longer works after icu4c 72 upgrade

Error

Warning: No available formula with the name "icu4c@78" (dependency of shivammathur/php/php@7.0). Did you mean icu4c@77, icu4c@76, icu4c@75 or icu4c@74?

Full CI output:

+ brew install shivammathur/php/php@7.0
Warning: shivammathur/php/php@7.0 has been deprecated because it is deprecated upstream! It was disabled on 2020-01-10.
==> Fetching downloads for: php@7.0
==> Downloading https://ghcr.io/v2/shivammathur/php/php/7.0/manifests/7.0.33_16
Warning: No available formula with the name "icu4c@78" (dependency of shivammathur/php/php@7.0). Did you mean icu4c@77, icu4c@76, icu4c@75 or icu4c@74?

Error: Process completed with exit code 1.

Impact

This is blocking new PRs from being merged.