Make remaining `curl` respect `HOMEBREW_CURLRC`

Update vendored gems

- backports to 3.11.4
- plist to 3.4.0

Use Bundler to manage vendor directory

Rather than having to manually keep track of what version each thing in
here is and copy files around by hand on update let's use Bundler's
standalone mode and careful use of `.gitignore` to help us do it.

This means a `bundle update --standalone` will allow us to update all
gems in vendor.

We could consider vendoring other gems this way in future but I'd
suggest only doing this for gems with no dependencies or at least gems
with no native extensions. The only gem this applies to that we
currently use is `ruby-prof` and I'm not convinced it's widely used
enough to warrant vendoring for everyone. Perhaps that's another
criteria: it should be functionality that's used by non-developer
commands and/or normal Homebrew usage.

use 'number_readable' when displaying analytics

Upgrade: implement linkage repair

Elide default root_url in the bottle block

cmd/shellenv: use Bash.

Try Azure Pipelines

This speeds up execution by 3x on my machine and the script is simple
enough to warrant this.

dev-cmd/bottle: fix --keep-old with --root-url

Fix extracting `.pax` archives.

Increase the unit test coverage of messages.rb

Don't strip the : from root_url when using --keep-old.
Closes #4554.

After upgrading existing kegs, we now search and upgrade their
dependents as well. If any are detected that have broken linkage, they
are reinstalled from source.

If there are any formulae in the dependents tree that are pinned, they
are only reinstalled if they're not outdated; in all cases, a suitable
message is printed detailing the kegs that will be acted upon.

Set HOMEBREW_BOTTLE_DEFAULT_DOMAIN based on operating system

This increases the messages.rb unit test coverage to 100%.

Resolve formulae in `brew cleanup`.

README: remove DomT4.

I resign from Homebrew with immediate effect.

Goodbye Homebrew.

docs/Maintainer-Guidelines: retire lead maintainer position in Febuary.

Bump parser from 2.5.1.0 to 2.5.1.2 in /Library/Homebrew/test

Merge pull request #4881 from Homebrew/dependabot/bundler/Library/Homebrew/test/rspec-expectations-3.8.1

Bump rspec-expectations from 3.8.0 to 3.8.1 in /Library/Homebrew/test

Bump commonmarker from 0.17.12 to 0.17.13 in /docs

Bump docile from 1.3.0 to 1.3.1 in /Library/Homebrew/test

Merge pull request #4883 from Homebrew/dependabot/bundler/Library/Homebrew/test/ruby-progressbar-1.10.0

Bump ruby-progressbar from 1.9.0 to 1.10.0 in /Library/Homebrew/test

Bumps [ruby-progressbar](https://github.com/jfelchner/ruby-progressbar) from 1.9.0 to 1.10.0.
- [Release notes](https://github.com/jfelchner/ruby-progressbar/releases)
- [Changelog](https://github.com/jfelchner/ruby-progressbar/blob/master/CHANGELOG.md)
- [Commits](https://github.com/jfelchner/ruby-progressbar/compare/releases/v1.9.0...releases/v1.10.0

)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Bumps [parser](https://github.com/whitequark/parser) from 2.5.1.0 to 2.5.1.2.
- [Release notes](https://github.com/whitequark/parser/releases)
- [Changelog](https://github.com/whitequark/parser/blob/master/CHANGELOG.md)
- [Commits](https://github.com/whitequark/parser/compare/v2.5.1.0...v2.5.1.2

)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Bumps [rspec-expectations](https://github.com/rspec/rspec-expectations) from 3.8.0 to 3.8.1.
- [Release notes](https://github.com/rspec/rspec-expectations/releases)
- [Changelog](https://github.com/rspec/rspec-expectations/blob/master/Changelog.md)
- [Commits](https://github.com/rspec/rspec-expectations/compare/v3.8.0...v3.8.1

)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Bumps [commonmarker](https://github.com/gjtorikian/commonmarker) from 0.17.12 to 0.17.13.
- [Release notes](https://github.com/gjtorikian/commonmarker/releases)
- [Commits](https://github.com/gjtorikian/commonmarker/compare/v0.17.12...v0.17.13

)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Bumps [docile](https://github.com/ms-ati/docile) from 1.3.0 to 1.3.1.
- [Release notes](https://github.com/ms-ati/docile/releases)
- [Changelog](https://github.com/ms-ati/docile/blob/master/HISTORY.md)
- [Commits](https://github.com/ms-ati/docile/compare/v1.3.0...v1.3.1

)

Signed-off-by: dependabot[bot] <support@dependabot.com>