4.6.20

What's Changed

• Don't fail if a formula stub doesn't exist when checking Formula#outdated? by @Rylan12 in #20948
• Use formula stubs for shellcheck, shfmt, and actionlint operations in brew style by @Rylan12 in #20949
• dev-cmd/tests: remove HOMEBREW_USE_INTERNAL_API from test environment. by @MikeMcQuaid in #20950
• patches audit: add correctors by @Moisan in #20943
• Improvements to HOMEBREW_USE_INTERNAL_API by @Rylan12 in #20947
• Document HOMEBREW_USE_INTERNAL_API by @MikeMcQuaid in #20951
• github_runner_matrix: always deploy arm64 linux runner for bottling by @cho-m in #20957
• Add brew lgtm command to run multiple style checks in one command. by @MikeMcQuaid in #20958
• Bump the "all" group with 3 updates across multiple ecosystems by @dependabot[bot] in #20961
• download_queue: fix context bleeding out from threads. by @MikeMcQuaid in #20962
• resource_auditor: skip ftp.gnu.org audit by @cho-m in #20964
• checksum, version: improve .inspect output by @MikeMcQuaid in #20965
• dev-cmd/bump-cask-pr: add audit exceptions by @bevanjkay in #20939

Full Changelog: 4.6.19...4.6.20