Vulkan backend: Add missing include of cstdint

[martinlsm]

backends/vulkan/runtime/utils/StorageUtils.h was referring to definitions like uint8_t without including the header cstdint. This resulted in a risk of facing compilation errors on some systems. Fix this problem by including the header.

cc @SS-JIA @manuelcandales @digantdesai @cbilgin

[pytorch-bot]

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❌ 7 New Failures, 2 Unrelated Failures

As of commit 935a0a6 with merge base 7215b88 ():

NEW FAILURES - The following jobs have failed:

• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t e4463671028611380e1c4bab9b66d514ee811e27ac8868689968e80f7cc68a53 /exec failed with exit code 1
• pull / unittest-nxp-neutron / linux-job (gh)
  RuntimeError: Command docker exec -t 31b9c63d129bafa588caa06ae38e60e87c2e80275b4e97e36dcf9d0d9edc7626 /exec failed with exit code 1
• Test CUDA Builds / export-gemma3-cuda-non-quantized / linux-job (gh)
  RuntimeError: Command docker exec -t 994f5ffa426576b53fb592cc1b59b660d19f3237428bb20b0431e8502a226dc9 /exec failed with exit code 2
• Test CUDA Builds / export-voxtral-cuda-non-quantized / linux-job (gh)
  RuntimeError: Command docker exec -t 470da3874dbd0e01a29910767730f2658069ff09496ca245698d7b6199658926 /exec failed with exit code 2
• Test CUDA Builds / export-voxtral-cuda-quantized-int4-tile-packed / linux-job (gh)
  RuntimeError: Command docker exec -t cbbd7c6c4e2b9fe6062ebb2e112b3362247f7b89e9fe3f7941b90236478c9dcb /exec failed with exit code 2
• Test CUDA Builds / export-voxtral-cuda-quantized-int4-weight-only / linux-job (gh)
  RuntimeError: Command docker exec -t ef1f395080dc044185669e4c7d4c7a8041287f528803f0d5047db354fd2ac2b2 /exec failed with exit code 2
• Test Metal Backend / export-voxtral-metal-artifact / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 2

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• pull / unittest / linux / linux-job (gh) (matched linux rule in flaky-rules.json)
  The runner has received a shutdown signal. This can happen when the runner service is stopped, or a manually started runner is canceled.

BROKEN TRUNK - The following job failed but was present on the merge base:

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

• pull / unittest-editable / linux / linux-job (gh) (trunk failure)

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[martinlsm]

This problem is causing issues in our CI-tests so it would be great if we could merge this patch ASAP