Co-Authored-By: Mike McQuaid <mike@mikemcquaid.com>

Co-Authored-By: Eric Knibbe <3324775+EricFromCanada@users.noreply.github.com>

extend/os/mac/keg_relocate: fix post-bottling dylib ID relocation

Running `brew bottle` changes dylib IDs, install names, and rpaths into
placeholders for the bottle, creates a bottle tarball, and then changes
the placeholders back to their correct values.

With my refactoring in #11358, the behaviour of this relocation changed:
dylib IDs would no longer be changed back from placeholders into their
correct values after the creation of the bottle tarball.

Add cop for IO.read usage

dev-cmd/bottle: make gzip creation consistent across platforms

Delete Bintray code

Remove all code related to Bintray. It no longer works so there's no
point keeping it around.

Some of this could arguably be deprecated/disabled first/instead but:
I'm not sure I see the sense in keeping stuff around that's known to be
broken.

rubocops/shell_commands: add cop for shell metacharacters in `exec`

formula_installer: write tab when pouring local --only-json-tab bottles

extend/os/mac/keg_relocate: refactor `relocate_dynamic_linkage`

system_command: better handle race conditions when interrupting

fix: use recommended way of updating Fish shell $PATH

system_command: fix rare scenario of interrupt being reported to stderr

os/mac: use perl 5.18 on Catalina

sorbet: Update RBI files.

Autogenerated by the [sorbet](https://github.com/Homebrew/brew/blob/master/.github/workflows/sorbet.yml) workflow.

Following feedback from #11331.

release_notes: append #PR to markdown link text

Some merge commits don't include the title of the pull request
on subsequent lines, leaving the markdown link text blank
in the release notes. This appends the subject line of the
commit message instead if the body is missing and adds a test
case.