[Snyk] Fix for 1 vulnerabilities

[mefellows]

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

⚠️ Warning

``` Failed to update the Gemfile.lock, please update manually before merging. ```

#### Vulnerabilities that will be fixed ##### With an upgrade: Severity | Priority Score (*) | Issue | Breaking Change | Exploit Maturity :-------------------------:|-------------------------|:-------------------------|:-------------------------|:-------------------------  | **661/1000**
**Why?** Recently disclosed, Has a fix available, CVSS 7.5 | Denial of Service (DoS)
[SNYK-RUBY-RACK-3356639](https://snyk.io/vuln/SNYK-RUBY-RACK-3356639) | 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/pact-foundation-808/project/f7e75088-1a42-4c24-aac7-2ba964dff8e3?utm_source=github&utm_medium=referral&page=fix-pr) 🛠 [Adjust project settings](https://app.snyk.io/org/pact-foundation-808/project/f7e75088-1a42-4c24-aac7-2ba964dff8e3?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":"2dc8ac0e-b56c-48be-8537-4d481592d0a2","prPublicId":"2dc8ac0e-b56c-48be-8537-4d481592d0a2","dependencies":[{"name":"pact_broker","from":"2.105.0","to":"2.105.0"},{"name":"rack-test","from":"2.0.2","to":"2.0.2"}],"packageManager":"rubygems","projectPublicId":"f7e75088-1a42-4c24-aac7-2ba964dff8e3","projectUrl":"https://app.snyk.io/org/pact-foundation-808/project/f7e75088-1a42-4c24-aac7-2ba964dff8e3?utm_source=github&utm_medium=referral&page=fix-pr","type":"auto","patch":[],"vulns":["SNYK-RUBY-RACK-3356639"],"upgrade":["SNYK-RUBY-RACK-3356639"],"isBreakingChange":false,"env":"prod","prType":"fix","templateVariants":["pr-warning-shown","priorityScore"],"priorityScoreList":[661]}) --- **Learn how to fix vulnerabilities with free interactive lessons:** 🦉 [Denial of Service (DoS)](https://learn.snyk.io/lessons/redos/javascript/?loc=fix-pr)

[bethesque]

This pr is for rack-test, not rack. No point.