gdal osm2pgrouting osmcoastline: use macOS expat

[cho-m]

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Avoid using brew expat as once it cascades we would need to migrate all formulae to deal with potential issues with loading multiple copies which have API/ABI change (somewhat related to reason why we have problem in first place with mismatched system header/library on Sonoma and Ventura).

Once oldest CI runner is Sequoia, we can consider CI-syntax-only changing all expat usage to uses_from_macos "expat", since: :sequoia for formulae where oldest bottle is Sequoia. At that point in time, we won't have to deal with rebottling.

[github-actions]

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