[Snyk] Security upgrade express from 4.16.4 to 4.21.2#253
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 ### Snyk has created this PR to fix 1 vulnerabilities in the yarn dependencies of this project. #### Snyk changed the following file(s): - `package.json` - `yarn.lock` #### Note for [zero-installs](https://yarnpkg.com/features/zero-installs) users If you are using the Yarn feature [zero-installs](https://yarnpkg.com/features/zero-installs) that was introduced in Yarn V2, note that this PR does not update the `.yarn/cache/` directory meaning this code cannot be pulled and immediately developed on as one would expect for a zero-install project - you will need to run `yarn` to update the contents of the `./yarn/cache` directory. If you are not using zero-install you can ignore this as your flow should likely be unchanged. #### Vulnerabilities that will be fixed with an upgrade: | | Issue | Score | :-------------------------:|:-------------------------|:-------------------------  | Regular Expression Denial of Service (ReDoS) <br/>[SNYK-JS-PATHTOREGEXP-8482416](https://snyk.io/vuln/SNYK-JS-PATHTOREGEXP-8482416) | **738** --- > [!IMPORTANT] > > - Check the changes in this PR to ensure they won't cause issues with your project. > - Max score is 1000. Note that the real score may have changed since the PR was raised. > - This PR was automatically created by Snyk using the credentials of a real user. --- **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: <img src="https://api.segment.io/v1/pixel/track?data=eyJ3cml0ZUtleSI6InJyWmxZcEdHY2RyTHZsb0lYd0dUcVg4WkFRTnNCOUEwIiwiYW5vbnltb3VzSWQiOiI4ZGU2ZmM1Yi1lZWVmLTQ2MGEtYmVkZS1lZWFjNDI5YjcwMWEiLCJldmVudCI6IlBSIHZpZXdlZCIsInByb3BlcnRpZXMiOnsicHJJZCI6IjhkZTZmYzViLWVlZWYtNDYwYS1iZWRlLWVlYWM0MjliNzAxYSJ9fQ==" width="0" height="0"/> 🧐 [View latest project report](https://app.snyk.io/org/mattbdean/project/400b3ef9-2e38-48de-8472-ec4332dca0a0?utm_source=github&utm_medium=referral&page=fix-pr) 📜 [Customise PR templates](https://docs.snyk.io/scan-using-snyk/pull-requests/snyk-fix-pull-or-merge-requests/customize-pr-templates?utm_source=github&utm_content=fix-pr-template) 🛠 [Adjust project settings](https://app.snyk.io/org/mattbdean/project/400b3ef9-2e38-48de-8472-ec4332dca0a0?utm_source=github&utm_medium=referral&page=fix-pr/settings) 📚 [Read about Snyk's upgrade logic](https://docs.snyk.io/scan-with-snyk/snyk-open-source/manage-vulnerabilities/upgrade-package-versions-to-fix-vulnerabilities?utm_source=github&utm_content=fix-pr-template) --- **Learn how to fix vulnerabilities with free interactive lessons:** 🦉 [Regular Expression Denial of Service (ReDoS)](https://learn.snyk.io/lesson/redos/?loc=fix-pr) [//]: # 'snyk:metadata:{"customTemplate":{"variablesUsed":[],"fieldsUsed":[]},"dependencies":[{"name":"express","from":"4.16.4","to":"4.21.2"}],"env":"prod","issuesToFix":["SNYK-JS-PATHTOREGEXP-8482416"],"prId":"8de6fc5b-eeef-460a-bede-eeac429b701a","prPublicId":"8de6fc5b-eeef-460a-bede-eeac429b701a","packageManager":"yarn","priorityScoreList":[738],"projectPublicId":"400b3ef9-2e38-48de-8472-ec4332dca0a0","projectUrl":"https://app.snyk.io/org/mattbdean/project/400b3ef9-2e38-48de-8472-ec4332dca0a0?utm_source=github&utm_medium=referral&page=fix-pr","prType":"fix","templateFieldSources":{"branchName":"default","commitMessage":"default","description":"default","title":"default"},"templateVariants":["updated-fix-title","priorityScore"],"type":"auto","upgrade":["SNYK-JS-PATHTOREGEXP-8482416"],"vulns":["SNYK-JS-PATHTOREGEXP-8482416"],"patch":[],"isBreakingChange":false,"remediationStrategy":"vuln"}'
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