Brew: 4.0.6 Release

<!-- Release notes generated using configuration in .github/release.yml at master -->

What's Changed

• rubocop: Enable Layout/MultilineMethodCallIndentation & fix offenses by @issyl0 in https://github.com/Homebrew/brew/pull/14877
• rubocop: Deal with RSpec cop TODOs by @issyl0 in https://github.com/Homebrew/brew/pull/14884
• rubocops/cask: Disallow protocol in cask URL verified stanza by @issyl0 in https://github.com/Homebrew/brew/pull/14886
• rubocops/cask: Clean up unnecessary requires by @issyl0 in https://github.com/Homebrew/brew/pull/14891
• sorbet: Bump more files to typed: true by @issyl0 in https://github.com/Homebrew/brew/pull/14893
• irb: add cask monkey patch by @apainintheneck in https://github.com/Homebrew/brew/pull/14885
• Fix type error in brew --env by @dduugg in https://github.com/Homebrew/brew/pull/14880
• cask: retry audit for correct signing of pkg installers by @SMillerDev in https://github.com/Homebrew/brew/pull/14883
• rubocop: Trim exclude paths without offenses; move some more config by @issyl0 in https://github.com/Homebrew/brew/pull/14878
• Move Array#to_sentence monkey-patch from ActiveSupport to extend/ by @dduugg in https://github.com/Homebrew/brew/pull/14847
• Remove cask/cmd/zap by @hyuraku in https://github.com/Homebrew/brew/pull/14864
• brew style --fix by @dduugg in https://github.com/Homebrew/brew/pull/14904
• Fix "undefined local variable" error in update-report by @dduugg in https://github.com/Homebrew/brew/pull/14903
• Enable typing in cmd/ by @dduugg in https://github.com/Homebrew/brew/pull/14911
• sorbet: Autogenerate the RBI file for utils/tty.rb by @issyl0 in https://github.com/Homebrew/brew/pull/14896
• when brew cat fails, suggest brew info --github by @g0t4 in https://github.com/Homebrew/brew/pull/14902
• lock_file: better message if too many open files by @scpeters in https://github.com/Homebrew/brew/pull/14879
• ci: Move from Ubuntu 18.04 to Ubuntu 20.04 Actions runners by @issyl0 in https://github.com/Homebrew/brew/pull/14910
• Revert splat changes to AbstractUninstall by @dduugg in https://github.com/Homebrew/brew/pull/14914
• Refactor searchable by @dduugg in https://github.com/Homebrew/brew/pull/14916
• Fix {MacOS,Xcode}Requirement handling and improve output by @nandahkrishna in https://github.com/Homebrew/brew/pull/14870
• Remove ActiveSupport String inflections by @dduugg in https://github.com/Homebrew/brew/pull/14917
• brew irb improvements by @apainintheneck in https://github.com/Homebrew/brew/pull/14892
• download_strategy: handle incorrectly quoted filename* headers by @gibfahn in https://github.com/Homebrew/brew/pull/14829
• bump-formula-pr: add release notes if found by @SMillerDev in https://github.com/Homebrew/brew/pull/14918
• rubocop: Trim Naming/MethodParameterName allowlist by @issyl0 in https://github.com/Homebrew/brew/pull/14922
• github_packages: retry skopeo copy 5 times by @dawidd6 in https://github.com/Homebrew/brew/pull/14926
• Make str variable names longer by @issyl0 in https://github.com/Homebrew/brew/pull/14927
• sorbet: Run brew typecheck --update --suggest-typed on schedule in CI by @issyl0 in https://github.com/Homebrew/brew/pull/14921
• rubocop: Clean up Style/BlockDelimiters excludes and autofix offenses by @issyl0 in https://github.com/Homebrew/brew/pull/14920
• include --cask or --formula in brew info --github suggestion by @g0t4 in https://github.com/Homebrew/brew/pull/14930
• github_packages: additional retry of skopeo copy with backoff by @dawidd6 in https://github.com/Homebrew/brew/pull/14932
• Move cask/cmd/upgrade to cask/upgrade by @hyuraku in https://github.com/Homebrew/brew/pull/14913
• Fix DescriptionCacheStore searching by @dduugg in https://github.com/Homebrew/brew/pull/14941
• Cleanup irb history file in tests by @apainintheneck in https://github.com/Homebrew/brew/pull/14940
• Enable typing in a few more files by @dduugg in https://github.com/Homebrew/brew/pull/14937

New Contributors

• @g0t4 made their first contribution in https://github.com/Homebrew/brew/pull/14902

Full Changelog: https://github.com/Homebrew/brew/compare/4.0.5...4.0.6