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v11.9 release docs#9058

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amyblais wants to merge 23 commits into

v11.9-documentationmattermost/docs:v11.9-documentationfrom

claude/issue-9054-20260617-1059mattermost/docs:claude/issue-9054-20260617-1059Copy head branch name to clipboard

Conversation Commits23 (23)Checks Files changed

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v11.9 release docs#9058
amyblais wants to merge 23 commits into
v11.9-documentationfrom
claude/issue-9054-20260617-1059

Update important-upgrade-notes.rst

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