Bump macOS SDK version to 10.13 for gitian builds #14797
Description
http://doc-snapshots.qt.io/qt5-5.12/macos.html#supported-versions
It seems we must have 10.13+ SDK to build for macOS 10.14 .
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http://doc-snapshots.qt.io/qt5-5.12/macos.html#supported-versions
It seems we must have 10.13+ SDK to build for macOS 10.14 .