[Snyk] Security upgrade html-proofer from 3.19.3 to 3.19.3

[jsf9k]

This PR was automatically created by Snyk using the credentials of a real user.

Snyk has created this PR to fix one or more vulnerable packages in the `rubygems` dependencies of this project.

#### Changes included in this PR - Changes to the following files to upgrade the vulnerable dependencies to a fixed version: - Gemfile - Gemfile.lock #### Vulnerabilities that will be fixed ##### With an upgrade: Severity | Priority Score (*) | Issue | Breaking Change | Exploit Maturity :-------------------------:|-------------------------|:-------------------------|:-------------------------|:-------------------------  | **696/1000**
**Why?** Recently disclosed, Has a fix available, CVSS 8.2 | Improper Handling of Unexpected Data Type
[SNYK-RUBY-NOKOGIRI-2840634](https://snyk.io/vuln/SNYK-RUBY-NOKOGIRI-2840634) | No | No Known Exploit (*) Note that the real score may have changed since the PR was raised. Check the changes in this PR to ensure they won't cause issues with your project. ------------ **Note:** *You are seeing this because you or someone else with access to this repository has authorized Snyk to open fix PRs.* For more information: 🧐 [View latest project report](https://app.snyk.io/org/cisagov/project/2df8d912-a8d7-4d47-8c28-1db640bb2bea?utm_source=github&utm_medium=referral&page=fix-pr) 🛠 [Adjust project settings](https://app.snyk.io/org/cisagov/project/2df8d912-a8d7-4d47-8c28-1db640bb2bea?utm_source=github&utm_medium=referral&page=fix-pr/settings) 📚 [Read more about Snyk's upgrade and patch logic](https://support.snyk.io/hc/en-us/articles/360003891078-Snyk-patches-to-fix-vulnerabilities) [//]: # (snyk:metadata:{"prId":"0b77909b-afab-487d-a4ce-078ee578c0d5","prPublicId":"0b77909b-afab-487d-a4ce-078ee578c0d5","dependencies":[{"name":"html-proofer","from":"3.19.3","to":"3.19.3"}],"packageManager":"rubygems","projectPublicId":"2df8d912-a8d7-4d47-8c28-1db640bb2bea","projectUrl":"https://app.snyk.io/org/cisagov/project/2df8d912-a8d7-4d47-8c28-1db640bb2bea?utm_source=github&utm_medium=referral&page=fix-pr","type":"auto","patch":[],"vulns":["SNYK-RUBY-NOKOGIRI-2840634"],"upgrade":["SNYK-RUBY-NOKOGIRI-2840634"],"isBreakingChange":false,"env":"prod","prType":"fix","templateVariants":["updated-fix-title","priorityScore"],"priorityScoreList":[696]}) --- **Learn how to fix vulnerabilities with free interactive lessons:** 🦉 [Learn about vulnerability in an interactive lesson of Snyk Learn.](https://learn.snyk.io?loc=fix-pr)

[mcdonnnj]

Snyk has been removed from the organization.