Remove redundant check in formula_files and cask_files

Both formula_files and cask_files need to check whether a file is
a Ruby file. Also, use this method in formula_file? and cask_file?

Update manpages

Bump jekyll-watch from 2.1.0 to 2.1.1 in /docs

- dev-cmd/man: sort the `cmd_path`s (for APFS)
- update manpages based on latest content

Bumps [jekyll-watch](https://github.com/jekyll/jekyll-watch) from 2.1.0 to 2.1.1.
- [Release notes](https://github.com/jekyll/jekyll-watch/releases)
- [Changelog](https://github.com/jekyll/jekyll-watch/blob/master/History.markdown)
- [Commits](https://github.com/jekyll/jekyll-watch/compare/v2.1.0...v2.1.1

)

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

Bump jekyll-watch from 2.0.0 to 2.1.0 in /docs

Merge pull request #5078 from Homebrew/dependabot/bundler/Library/Homebrew/test/rspec-expectations-3.8.2

Bump rspec-expectations from 3.8.1 to 3.8.2 in /Library/Homebrew/test

audit: permit openblas for non-official taps

macOS provides Accelerate but not OpenBLAS

Bumps [rspec-expectations](https://github.com/rspec/rspec-expectations) from 3.8.1 to 3.8.2.
- [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/v3.8.1...v3.8.2

)

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

Bumps [jekyll-watch](https://github.com/jekyll/jekyll-watch) from 2.0.0 to 2.1.0.
- [Release notes](https://github.com/jekyll/jekyll-watch/releases)
- [Changelog](https://github.com/jekyll/jekyll-watch/blob/master/History.markdown)
- [Commits](https://github.com/jekyll/jekyll-watch/compare/v2.0.0...v2.1.0

)

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

Formula_files consists of every non-recursive child of formula_dir,
for which formula_file? evaluates to true. formula_file? checks if the file
is a child of formula_dir, which it is by definition. It turns out that by
removing the check, the time used for 'brew search' decreased from 800 ms to
700 ms, noticably faster during tab completion. The same happens with
cask_files and cask_file?

Bump codecov from 0.1.11 to 0.1.13 in /Library/Homebrew/test

docs/Maintainer-Guidelines: change lead maintainer date.

I'll step down on February 4th to better coincide with the Homebrew
maintainers in-person conference. This will make it easier to resolve
any logistical issues that arise.

remove appcast checkpoint audit

audit: remove `openssl@1.1` from unstable spec whitelist

audit: Permit HEAD for non-official taps

update-reset: fix Bash syntax.

This isn't valid syntax for a Bash array.

Remove the `accessibility_access` stanza.

style: check Bash style with shellcheck

Remove unused `include`.

Merge pull request #5062 from Homebrew/dependabot/bundler/Library/Homebrew/test/rubocop-rspec-1.30.0

Bump rubocop-rspec from 1.29.1 to 1.30.0 in /Library/Homebrew/test

zip: restore extended attributes when under MacOS

Use ActiveSupport’s `#days`.

Bumps [codecov](https://github.com/codecov/codecov-ruby) from 0.1.11 to 0.1.13.
- [Release notes](https://github.com/codecov/codecov-ruby/releases)
- [Changelog](https://github.com/codecov/codecov-ruby/blob/master/CHANGELOG.md)
- [Commits](https://github.com/codecov/codecov-ruby/compare/v0.1.11...v0.1.13

)

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

Bumps [rubocop-rspec](https://github.com/rubocop-hq/rubocop-rspec) from 1.29.1 to 1.30.0.
- [Release notes](https://github.com/rubocop-hq/rubocop-rspec/releases)
- [Changelog](https://github.com/rubocop-hq/rubocop-rspec/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop-hq/rubocop-rspec/compare/v1.29.1...v1.30.0

)

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

cask/audit: remove cask specific sourceforge URL audits