chore: bump Homebrew/actions/setup-homebrew from 2026.08.31.1 to 2026.09.21.1

[dependabot]

Bumps Homebrew/actions/setup-homebrew from 2026.08.31.1 to 2026.09.21.1.

Release notes

Sourced from Homebrew/actions/setup-homebrew's releases.

2026.09.21.1

What's Changed

• workflows: stop syncing and testing master by @​MikeMcQuaid in Homebrew/actions#934
• node_modules: ignore hidden lockfile by @​p-linnane in Homebrew/actions#935
• Synchronize shared configuration by @​BrewTestBot in Homebrew/actions#936
• Synchronize shared configuration by @​BrewTestBot in Homebrew/actions#937
• build(deps): bump the npm group with 3 updates by @​dependabot[bot] in Homebrew/actions#938
• build(deps): bump the github-actions group across 1 directory with 2 updates by @​dependabot[bot] in Homebrew/actions#939

Full Changelog: Homebrew/actions@2026.09.13.1...2026.09.21.1

2026.09.13.1

What's Changed

• remove-disabled-packages: use standalone Ruby by @​p-linnane in Homebrew/actions#924
• Synchronize shared configuration by @​BrewTestBot in Homebrew/actions#925
• remove-disabled-packages: add tests by @​p-linnane in Homebrew/actions#926
• build(deps): bump Homebrew/actions/setup-homebrew from 2026.08.31.1 to 2026.09.07.1 in the github-actions group across 1 directory by @​dependabot[bot] in Homebrew/actions#928
• build(deps): bump the npm group with 5 updates by @​dependabot[bot] in Homebrew/actions#927
• create-or-update-issue: add type by @​cho-m in Homebrew/actions#929
• create-or-update-issue: increase test coverage by @​cho-m in Homebrew/actions#930
• workflows: check vendored dependencies by @​p-linnane in Homebrew/actions#931
• workflows: vendor Dependabot npm updates automatically by @​p-linnane in Homebrew/actions#932

Full Changelog: Homebrew/actions@2026.09.07.1...2026.09.13.1

2026.09.07.1

What's Changed

• Synchronize shared configuration by @​BrewTestBot in Homebrew/actions#921
• build(deps): bump the github-actions group across 1 directory with 2 updates by @​dependabot[bot] in Homebrew/actions#923
• build(deps): bump the npm group with 3 updates by @​dependabot[bot] in Homebrew/actions#922

Full Changelog: Homebrew/actions@2026.08.31.1...2026.09.07.1

Commits

• 848c272 Merge pull request #939 from Homebrew/dependabot/github_actions/github-action...
• f316292 Merge pull request #938 from Homebrew/dependabot/npm_and_yarn/npm-372e9df88c
• 7f5e5db build(deps): bump the github-actions group across 1 directory with 2 updates
• 5532d81 node_modules: update
• 38f8d3c build(deps): bump the npm group with 3 updates
• 75658ce Merge pull request #937 from Homebrew/sync-shared-config
• 2d398a7 licenses.yml: update to match main configuration
• 7b92cae check-licenses.sh: update to match main configuration
• 304fc86 Merge pull request #936 from Homebrew/sync-shared-config
• c2b5578 .ruby-version: update to match main configuration
• Additional commits viewable in compare view

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PR Summary

Low Risk
Routine GitHub Actions dependency pin update with no application or formula logic changes.

Overview
Updates the Audit Formulae workflow to pin Homebrew/actions/setup-homebrew from 2026.08.31.1 (3cdb78d…) to 2026.09.21.1 (848c272…). No other workflow inputs or audit steps change—only the action version used for the “Set up Homebrew” step.

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[dependabot]

Superseded by #68.