Forward v1.20.6 release commit to main

Editor assessment

The subject states the automation step exactly: the v1.20.6 release commit is forwarded to main. Type chore is accurate for release bookkeeping, the version is named, and no body is needed because the mechanical action is fully described. No footers beyond the PR number. Hygiene is clean: imperative, short, no junk. A small, complete message that tells maintainers exactly which release bookkeeping occurred and where it landed.