Update libomp-version to 22.1.6 from 21.1.8

[zosopentoolsmain]

No description provided.

[augmentcode]

🤖 Augment PR Summary

Summary: Updates the OpenMP/libomp port to use LLVM release version 22.1.6 instead of 21.1.8.
Changes: Bumps LIBOMP_VERSION in buildenv, which propagates to the LLVM release download URLs and version reporting.

_{🤖 Was this summary useful? React with 👍 or 👎}

[augmentcode]

Review completed. 1 suggestion posted.

Comment augment review to trigger a new review at any time.

[augmentcode]

With ZOPEN_CLEAN="skip", bumping LIBOMP_VERSION can accidentally reuse an existing cmake/ directory from the previous version because zopen_post_extract only downloads CMake sources when cmake/ is missing. That can produce mixed-version sources in incremental builds; consider ensuring the cmake/ dir is refreshed when LIBOMP_VERSION changes.

Severity: medium

_{🤖 Was this useful? React with 👍 or 👎, or 🚀 if it prevented an incident/outage.}