py-pyobjc: fix Quartz module on macOS 15

[breun]

Description

Fix build of Quartz module by setting deployment target to macOS 14 (see Sequoia Problems), because CGWindowListCreateImageFromArray is no longer available on macOS 15.

Type(s)

• bugfix

Tested on

macOS 15.0.1 24A348 arm64
Xcode 16.0 16A242d

Verification

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[macportsbot]

Notifying maintainers:
@danchr for port py-pyobjc.

[reneeotten]

so which PR for py-pyobjc do you want to merge? I would think ideally one updates the port and then if this workaround is still needed do that as well?

[breun]

This PR is the fix for the Quartz module which currently fails to build on macOS 15 and #26182 is the PR to update PyObjC to the latest version. The latest version still needs this workaround for the Quartz module.

If we merge this one first, I'll fix the other one up.

[reneeotten]

just combine the two