[UR][L0] Release parent of sub-buffer when sub-buffer dies

[nrspruit]

This commit fixes an issue where the sub-buffer object in the L0 V1 adapter would not release its retained parent, causing leaks.

[github-actions]

Unified Runtime -> intel/llvm Repo Move Notice

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The source code of Unified Runtime has been moved to intel/llvm under the unified-runtime top-level directory,
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