libocispec: sync from upstream

[giuseppe]

Closes: #1921

Summary by Sourcery

Sync the vendored libocispec library with its upstream version to incorporate the latest spec updates and fixes.

Bug Fixes:

• Pull in upstream libocispec fixes related to OCI spec handling by updating to the latest version.

Enhancements:

• Refresh the bundled libocispec code to stay aligned with upstream development.

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[packit-as-a-service]

TMT tests failed. @containers/packit-build please check.

[giuseppe]

@jnovy PTAL

[giuseppe]

@flouthoc PTAL

[jnovy]

Confirming the libocispec update now includes runtime-spec commit 869b2d5 (pids cgroup settings), which was missing in the previous version. LGTM