update the actions/cache version for ios to v4

[gpx1000]

Description

Fix the CI/CD build for ios by updating the cache

Fixes #

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• My code follows the coding style
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• I have tested every sample to ensure everything runs correctly
• This PR describes the scope and expected impact of the changes I am making

Note: The Samples CI runs a number of checks including:

• I have updated the header Copyright to reflect the current year (CI build will fail if Copyright is out of date)
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If this PR contains framework changes:

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Sample Checklist

If your PR contains a new or modified sample, these further checks must be carried out in addition to the General Checklist:

• I have tested the sample on at least one compliant Vulkan implementation
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[SRSaunders]

@gpx1000, while you are at it should you update the Vulkan SDK version in the iOS CI script to 1.4.304, or perhaps latest?

iOS is the only build target that requires linking to the SDK (for the iOS Vulkan framework). What will happen if the SDK is not in the cache, and needs to fall back to the retrieve action, but it does not match (or is lower than) the Vulkan Headers in the project? Will we get a version mismatch conflict at build or runtime? I am concerned about the breaking changes with the DynamicLoader namespace in #1281 causing issues here with earlier SDK versions.

- name: Load VulkanSDK from cache
        id: VulkanSDK
        uses: actions/cache@v4
        with:
          path: VulkanSDK
          key: vulkan

      - name: retrieve VulkanSDK
        if: steps.VulkanSDK.outputs.cache-hit != 'true'
        run: |
          wget https://sdk.lunarg.com/sdk/download/1.3.290.0/mac/vulkansdk-macos-1.3.290.0.dmg
          sudo hdiutil attach vulkansdk-macos-1.3.290.0.dmg
          sudo /Volumes/vulkansdk-macos-1.3.290.0/InstallVulkan.app/Contents/MacOS/InstallVulkan --root ~/VulkanSDK --accept-licenses --default-answer --confirm-command install com.lunarg.vulkan.ios
          sudo hdiutil detach /Volumes/vulkansdk-macos-1.3.290.0

[SaschaWillems]

LGTM 👍🏻 . As per discussion we should merge this ASAP in order to get PRs to properly build again.

[marty-johnson59]

OK, merging. LMK if it causes issues

[gary-sweet]

OK, merging. LMK if it causes issues

@marty-johnson59 It's causing issues for me at least. See #1297

[marty-johnson59]

Bummer. @gpx1000, can you investigate? Do we need to revert?

[SaschaWillems]

Is reverting possible? The reason for this PR Was that the submodule for astc did point to a no longer existing commit, and to my understanding that broke fresh cleanouts :/

[gpx1000]

I might have a way to fix this for you; I might have pulled from the wrong tag to what were previously using. I'll try going back to that tag instead.