Stick with icu4c 74.2 on macOS CI for PHP-8.1

PHP-8.1 is not ready for ICU >= 75.1 which requires C++17 support.
Thus we force the usage of icu4c@74, what is scheduled for removal in

Stick with icu4c 74.2 on macOS CI for PHP-8.1

PHP-8.1 is not ready for ICU >= 75.1 which requires C++17 support.
Thus we force the usage of icu4c@74, what is scheduled for removal in
May 2025, though.

Closes GH-16789.

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Use curl from brew on MacOS CI

This fixes issue in curl ext SSL client cert setting test.

Closes GH-11056

Fixes CI macOs, replacing now disabled tidyp dependency to tidy-html5.

Migrate CI to GitHub actions