Update release notes for 1.9.2609 - #8914

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Alex Sepkowski (alsepkow) merged 5 commits into

microsoft:mainfrom

alsepkow:release-notes-1.9.2609

Sep 12, 2026

Azure Pipelines / microsoft.DirectXShaderCompiler succeeded Sep 12, 2026 in 1h 47m 18s

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