Bumps [concurrent-ruby](https://github.com/ruby-concurrency/concurrent-ruby) from 1.1.4 to 1.1.5.
- [Release notes](https://github.com/ruby-concurrency/concurrent-ruby/releases)
- [Changelog](https://github.com/ruby-concurrency/concurrent-ruby/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ruby-concurrency/concurrent-ruby/compare/v1.1.4...v1.1.5

)

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

arch: actually show required architecture

Bump concurrent-ruby from 1.1.4 to 1.1.5 in /docs

Bumps [concurrent-ruby](https://github.com/ruby-concurrency/concurrent-ruby) from 1.1.4 to 1.1.5.
- [Release notes](https://github.com/ruby-concurrency/concurrent-ruby/releases)
- [Changelog](https://github.com/ruby-concurrency/concurrent-ruby/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ruby-concurrency/concurrent-ruby/compare/v1.1.4...v1.1.5

)

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

elf.rb: avoid corrupted elf files

Some elf files like unittest files or memory dumps may not be completely
readable by readelf.

Readelf will fail after the following message:
readelf: Warning: possibly corrupt ELF header - it has a non-zero program header offset, but no program headers

This patches avoid these files when there is a non zero offset but no
program headers

deps: fix --1 and --annotate options

Brew: remove prune completion for Bash

completions/zsh: Hide *instal from all commands

cpu: tests permit new families and architectures

Aliases like instal and uninstal are unhelpful and noisy; don't offer them

See also PR #3052

docs/_config.yml: shorten search placeholder.

Current one is truncated on macOS.

docs/_config.yml: enable documentation search.

Set the search placeholder badge, the index and trigger a new GitHub
Pages build (by merging this).

completions/zsh: Improve caching behaviour

cleanup: fix for formula/cask name collision

Improve wording

When a formula and cask share the same name, a download can be
incorrectly considered stale. Only check for if a download is a stale
formula or stale cask, but not both.

Fixes #5839

- Eliminate reliance on external utility calls for cache invalidation
- Update cache policy to also invalidate if cache file is >=2 weeks old or if
  tap indexes are non-existent
- Do not override any cache policy the user might already have set
- Handle default cache policy determination as early as possible to ensure that
  a default is set appropriately for all helpers (this will mostly be useful if
  other helpers need caching in the future)

Bump unicode-display_width from 1.4.1 to 1.5.0 in /docs

Bumps [unicode-display_width](https://github.com/janlelis/unicode-display_width) from 1.4.1 to 1.5.0.
- [Release notes](https://github.com/janlelis/unicode-display_width/releases)
- [Changelog](https://github.com/janlelis/unicode-display_width/blob/master/CHANGELOG.md)
- [Commits](https://github.com/janlelis/unicode-display_width/compare/v1.4.1...v1.5.0

)

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

Bump i18n from 1.5.3 to 1.6.0 in /Library/Homebrew

outdated & tap-info: set default value for --json

This means the output is consistent and ensures that we get rid of any local cruft when installing.

docs: linkify some links

Matching what's already been done for `brew info`.

utils/github: use tap.full_name

python_virtualenv_constants: upgrade virtualenv to 16.4.3