Brew: 6.0.15 Release

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

What's Changed

• workflows/docker: align deprecation of 22.04 image by @cho-m in https://github.com/Homebrew/brew/pull/23378
• Add PHP configuration action (16/24) by @MikeMcQuaid in https://github.com/Homebrew/brew/pull/23191
• Add Python bootstrap action (17/24) by @MikeMcQuaid in https://github.com/Homebrew/brew/pull/23192
• Align shared install step interfaces (18/24) by @MikeMcQuaid in https://github.com/Homebrew/brew/pull/23193
• Align install step autocorrections (20/24) by @MikeMcQuaid in https://github.com/Homebrew/brew/pull/23195
• Document canonical install steps (21/24) by @MikeMcQuaid in https://github.com/Homebrew/brew/pull/23196
• Plan remaining install hook migration (22/24) by @MikeMcQuaid in https://github.com/Homebrew/brew/pull/23197
• Bridge cask flight step migrations (19/26) by @MikeMcQuaid in https://github.com/Homebrew/brew/pull/23382
• Update migration delivery plan (23/24) by @MikeMcQuaid in https://github.com/Homebrew/brew/pull/23198
• Record final migration stacks (24/24) by @MikeMcQuaid in https://github.com/Homebrew/brew/pull/23199
• docs: fix errors reported by Vale 3.17.0 by @dduugg in https://github.com/Homebrew/brew/pull/23387
• formula-analytics: replace PyCall with subprocess by @MikeMcQuaid in https://github.com/Homebrew/brew/pull/23379
• Gemfile.lock: add checksums by @p-linnane in https://github.com/Homebrew/brew/pull/23389
• cask/config: define instance variables in a consistent order by @p-linnane in https://github.com/Homebrew/brew/pull/23388
• Add per-service user environment variable overrides by @IngmarStein in https://github.com/Homebrew/brew/pull/23312
• Suppress brew services tmux caveat on Linux by @HackAttack in https://github.com/Homebrew/brew/pull/23390
• Keep download progress within terminal width by @MikeMcQuaid in https://github.com/Homebrew/brew/pull/23391
• Parse only needed internal API payload entries by @MikeMcQuaid in https://github.com/Homebrew/brew/pull/23380
• install: isolate formula and cask fetch errors by @MikeMcQuaid in https://github.com/Homebrew/brew/pull/23385
• Make formula install-step var bases explicit by @MikeMcQuaid in https://github.com/Homebrew/brew/pull/23372
• ignorable: replace callcc with Fiber by @MikeMcQuaid in https://github.com/Homebrew/brew/pull/23393
• workflows/tap-new-tests: remove intel macOS from tap-new by @cho-m in https://github.com/Homebrew/brew/pull/23398
• sorbet: Fix the formula test helper block typing by @issyl0 in https://github.com/Homebrew/brew/pull/23397

New Contributors

• @HackAttack made their first contribution in https://github.com/Homebrew/brew/pull/23390

Full Changelog: https://github.com/Homebrew/brew/compare/6.0.14...6.0.15