build: bump runner image to macos-15

[YoloMao]

New Pull Request Checklist

• I have read and understood the CONTRIBUTING guide

• I have read the Documentation

• I have searched for a similar pull request in the project and found none

• I have updated this branch with the latest master to avoid conflicts (via merge from master or rebase)

• I have added the required tests to prove the fix/feature I am adding

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• I have run the tests and they pass

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This merge request fixes / refers to the following issues: ...

Pull Request Description

Due to actions/runner-images#10559 , should download visionOS SDK before running workflow.

[YoloMao]

On the other hand, you can also change the runner image to macos-15 public beta

[YoloMao]

ci run failed because it take wrong version of visionOS, when running xcodebuild -downloadPlatform visionOS, the visionOS version is 1.2 but current Xcode is 15.2(DEVELOPER_DIR: /Applications/Xcode_15.2.app)，shall we change Xcode version to 15.4?

[erik-bershel]

shall we change Xcode version to 15.4?

It's better to use Xcode 16.0 if you want to use latest visionOS simulator.

Simplest way is just to use macos-15 image instead of macos-14. But also might be done by switching using this:

    - uses: maxim-lobanov/setup-xcode@v1
      with:
        xcode-version: 16

[dreampiggy]

I think switch to Xcode 16 + macOS 15 is OK.

During my local test, I don't found huge regression on macOS 15 (iOS 18 simulator)

[YoloMao]

Done. See see @dreampiggy, there is some tests run failed, should be outside of this pr.

[dreampiggy]

The failed case test29ThatJFIFDecodeOrientationShouldNotApplyTwice, is a regression by design on iOS 18/tvOS 18/visionOS 2/watchOS 11, because I test some Apple's system framework (ImageIO.framework) behavior in that case, since Apple always change some internal details (but breaks SDWebImage's optimization)

You can just ignore this and I'll update the test case later.

[dreampiggy]

LGTM