[CI] Bump MACOSX_DEPLOYMENT_TARGET to 14
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Component: Continuous Integration
Type: enhancement
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- C++
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Description
### Describe the enhancement requested
We [recently noticed](https://github.com/apache/arrow/pull/49189#discussion_r2790304422) we mostly set `MACOSX_DEPLOYMENT_TARGET=12`, while according to https://endoflife.date/macos 14 is the oldest currently supported version.
### Component(s)
Continuous Integration
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