[Snyk] Security upgrade express from 4.17.2 to 4.17.3

[connorads]

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 `yarn` dependencies of this project.

#### Changes included in this PR - Changes to the following files to upgrade the vulnerable dependencies to a fixed version: - package.json - yarn.lock #### Vulnerabilities that will be fixed ##### With an upgrade: Severity | Priority Score (*) | Issue | Breaking Change | Exploit Maturity :-------------------------:|-------------------------|:-------------------------|:-------------------------|:-------------------------  | **768/1000**
**Why?** Proof of Concept exploit, Recently disclosed, Has a fix available, CVSS 7.5 | Prototype Pollution
[SNYK-JS-QS-3153490](https://snyk.io/vuln/SNYK-JS-QS-3153490) | No | Proof of Concept (*) 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/connorads/project/ec89874b-1e77-4a5f-860a-373978f1c449?utm_source=github&utm_medium=referral&page=fix-pr) 🛠 [Adjust project settings](https://app.snyk.io/org/connorads/project/ec89874b-1e77-4a5f-860a-373978f1c449?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":"9fd4cf8f-10b8-428d-b27b-b47a2be53bdb","prPublicId":"9fd4cf8f-10b8-428d-b27b-b47a2be53bdb","dependencies":[{"name":"express","from":"4.17.2","to":"4.17.3"}],"packageManager":"yarn","projectPublicId":"ec89874b-1e77-4a5f-860a-373978f1c449","projectUrl":"https://app.snyk.io/org/connorads/project/ec89874b-1e77-4a5f-860a-373978f1c449?utm_source=github&utm_medium=referral&page=fix-pr","type":"auto","patch":[],"vulns":["SNYK-JS-QS-3153490"],"upgrade":["SNYK-JS-QS-3153490"],"isBreakingChange":false,"env":"prod","prType":"fix","templateVariants":["updated-fix-title","priorityScore"],"priorityScoreList":[768]}) --- **Learn how to fix vulnerabilities with free interactive lessons:** 🦉 [Prototype Pollution](https://learn.snyk.io/lessons/prototype-pollution/javascript/?loc=fix-pr)

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[coveralls]

Coverage: 99.401% (+0.0%) from 99.401% when pulling e127cea1cba782d387224625710611975d40e377 on snyk-fix-5220e0311a9ebc66bc66ee1caf9cb7a7 into 4580539ae7882d08568e5d6e7f21ec9415a43fc7 on master.

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication