deps: point ggml to Adreno xmem SDPA PR

[happyyzy]

Summary

Updates the ggml submodule pointer to the local staging branch that adds the Adreno xmem SDPA path.

Corresponding ggml PR: happyyzy/ggml#3.

Notes

This PR is stacked on #2 and only updates the dependency pointer.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Point ggml at a commit from its configured remote

The submodule gitlink now points at 399ea717..., but .gitmodules still configures ggml to fetch from https://github.com/leejet/ggml.git; this SHA is available in happyyzy/ggml and not under leejet/ggml, so a fresh clone or CI job running git submodule update --init ggml from the configured URL cannot fetch the recorded commit. Please either push/merge the ggml commit to the configured remote or update the submodule URL/ref so the recorded SHA is fetchable.

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