DOCS: update news

[wfaderhold21]

What

Updates the news for 1.6 release

[greptile-apps]

Greptile Summary

• Updated the release date for v1.6.0 from October 13 to November 14, 2025
• Added four PR references to enhance release notes completeness: EC/CUDA fix (EC/CUDA: fix cuctx create in ec cuda #1219), CX7 gtest check (TEST: check CX7 in wait_on_data gtest #1127), CUDA managed memory support (TOOLS: add CUDA managed mem type to ucc_perftest #1199), and perftest fixes (Map src memory handle as global for perftest #1216)

Confidence Score: 5/5

• This PR is completely safe to merge with no risks
• This is a straightforward documentation update to the NEWS file that corrects the release date and adds legitimate PR references that are verified to exist in the git history and fall within the appropriate timeframe
• No files require special attention

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