Bump html-proofer from 3.18.5 to 3.18.6

Bumps [html-proofer](https://github.com/gjtorikian/html-proofer) from 3.18.5 to 3.18.6.
- [Release notes](https://github.com/gjtorikian/html-proofer/releases)
- [Commits](https://github.com/gjtorikian/html-proofer/compare/v3.18.5...v3.18.6)
8 jobs for dependabot/bundler/html-proofer-3.18.6 in 2 minutes and 48 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #231468
build:latest

00:01:05

passed #231471
build:production

00:01:03

passed #231470
build:production:review-apps

00:02:43

passed #231469
build:production:subpath

00:01:11

 
  Test
passed #231472
test:htmlproofer

00:01:12

passed #231473
test:htmlproofer:subpath

00:01:22

 
  Review
passed #231474
review-apps
review

00:00:03

passed #231475
review-apps manual
stop_review

00:00:00