[php-src] PR #24684: Adapt intl timezone test expectations for ICU 79.1

Pull Request: https://github.com/php/php-src/pull/24684 Author: kairosci The macOS runner now installs ICU 79.1, causing three intl tests to fail because their expected output reflects older ICU data. Portuguese full date formatting now uses +03:00 GMT, and the Canadian mapping for Windows Pacific Standard Time now returns America/Los_Angeles. Add ICU 79.1 test variants and limit the existing variants to older releases, retaining exact output checks. The observed changes are recorded in [the failing macOS job](https://github.com/php/php-src/actions/runs/40182427911/job/121136134766). Validation: related intl tests on a debug ZTS build with ICU 78.3 passed (5 passed, 7 skipped for other ICU versions). The new ICU 79.1 expectations were checked against the CI differences, and version selection was checked across the release boundary. ICU 79.1 execution remains for CI.