Migrate executorch moltenVK dep

[ocvh]

Summary: Update moltenVK_static_unexported dependency in executorch vulkan targets.bzl to use proper path

Differential Revision: D97210565

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/18304

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❌ 2 Awaiting Approval, 1 New Failure, 2 Unrelated Failures

As of commit 2f68905 with merge base 3906b58 ():

AWAITING APPROVAL - The following workflows need approval before CI can run:

• Build documentation (gh)
• Lint (gh)

NEW FAILURE - The following job has failed:

• pull / unittest-editable / macos / macos-job (gh)
  backends/xnnpack/test/ops/test_conv2d.py::TestConv2d::test_fp16_conv2d

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / unittest / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / unittest-editable / windows / windows-job (gh) (trunk failure)
  ##[error]The operation was canceled.

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[meta-codesync]

@ocvh has exported this pull request. If you are a Meta employee, you can view the originating Diff in D97210565.

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