Bumps [html-proofer](https://github.com/gjtorikian/html-proofer) from 3.17.1 to 3.17.3.
- [Release notes](https://github.com/gjtorikian/html-proofer/releases)
- [Commits](https://github.com/gjtorikian/html-proofer/compare/v3.17.1...v3.17.3

)

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

Migrate remaining audit exceptions to homebrew/core

pypi: downcase main package name

FAQ: Default installation prefix on Linux

Co-authored-by: Mike McQuaid <mike@mikemcquaid.com>

dev-cmd/unbottled: Fail nicely if `HOMEBREW_NO_ANALYTICS` is set

linkage: correctly detect missing kegs.

- manually `raise Errno::ENOENT` to ensure that a keg that doesn't exist
  isn't flagged as a system dependency.
- remove the inconsistent and incorrect summary messaging.

bintray: add type signatures

explicitly specify CMake libdir as lib

diagnostic: check all tap branches, not just core

global: fix `default_prefix?` definition

Refactor `brew typecheck` and upgrade `typed` sigils.

bottle merge: add support for linux cellar

- When testing `brew unbottled <formula>` this crashed because I, as a
  maintainer, have `HOMEBREW_NO_ANALYTICS` set on all my machines to
  avoid polluting the analytics with test installs.

```
❯ brew unbottled
==> Getting formulae...
==> Getting analytics data...
Error: undefined method `[]' for nil:NilClass
/usr/local/Homebrew/Library/Homebrew/dev-cmd/unbottled.rb:89:in `formulae_all_sort_installs_from_args'
/usr/local/Homebrew/Library/Homebrew/dev-cmd/unbottled.rb:49:in `unbottled'
/usr/local/Homebrew/Library/Homebrew/brew.rb:119:in `<main>'
```

livecheck: refactor url preprocessing

Co-authored-by: Mike McQuaid <mike@mikemcquaid.com>

Improve ZSH completions handling

Work around BOM `find` bug.

- Only display the completions caveats from the current shell (assuming
  it's one of Bash, ZSH or Fish)
- If the completions location isn't in the ZSH `FPATH` then link to the
  documentation explaining how to do so.

Fixes https://github.com/Homebrew/brew/issues/8984