[Snyk] Security upgrade webpack from 2.7.0 to 5.0.0#171

<h3>Snyk has created this PR to fix one or more vulnerable packages in the `yarn` dependencies of this project.</h3> #### Changes included in this PR - Changes to the following files to upgrade the vulnerable dependencies to a fixed version: - 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: Severity | Priority Score (*) | Issue | Breaking Change | Exploit Maturity :-------------------------:|-------------------------|:-------------------------|:-------------------------|:-------------------------  | **701/1000** <br/> **Why?** Recently disclosed, Has a fix available, CVSS 8.3 | Improper Verification of Cryptographic Signature <br/>[SNYK-JS-ELLIPTIC-8172694](https://snyk.io/vuln/SNYK-JS-ELLIPTIC-8172694) | Yes | No Known Exploit  | **828/1000** <br/> **Why?** Proof of Concept exploit, Recently disclosed, Has a fix available, CVSS 8.7 | Improper Verification of Cryptographic Signature <br/>[SNYK-JS-ELLIPTIC-8187303](https://snyk.io/vuln/SNYK-JS-ELLIPTIC-8187303) | Yes | 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: <img src="https://api.segment.io/v1/pixel/track?data=eyJ3cml0ZUtleSI6InJyWmxZcEdHY2RyTHZsb0lYd0dUcVg4WkFRTnNCOUEwIiwiYW5vbnltb3VzSWQiOiI1MmVlMjEzZC1mMmUwLTRmNTUtYTlmMy1mNGQxNTU2YTNkZGYiLCJldmVudCI6IlBSIHZpZXdlZCIsInByb3BlcnRpZXMiOnsicHJJZCI6IjUyZWUyMTNkLWYyZTAtNGY1NS1hOWYzLWY0ZDE1NTZhM2RkZiJ9fQ==" width="0" height="0"/> 🧐 [View latest project report](https://app.snyk.io/org/aikar/project/72953a9f-4b59-453d-b3a9-fcb61cfdf9bf?utm_source&#x3D;github&amp;utm_medium&#x3D;referral&amp;page&#x3D;fix-pr) 🛠 [Adjust project settings](https://app.snyk.io/org/aikar/project/72953a9f-4b59-453d-b3a9-fcb61cfdf9bf?utm_source&#x3D;github&amp;utm_medium&#x3D;referral&amp;page&#x3D;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":"52ee213d-f2e0-4f55-a9f3-f4d1556a3ddf","prPublicId":"52ee213d-f2e0-4f55-a9f3-f4d1556a3ddf","dependencies":[{"name":"webpack","from":"2.7.0","to":"5.0.0"}],"packageManager":"yarn","projectPublicId":"72953a9f-4b59-453d-b3a9-fcb61cfdf9bf","projectUrl":"https://app.snyk.io/org/aikar/project/72953a9f-4b59-453d-b3a9-fcb61cfdf9bf?utm_source=github&utm_medium=referral&page=fix-pr","type":"auto","patch":[],"vulns":["SNYK-JS-ELLIPTIC-8172694","SNYK-JS-ELLIPTIC-8187303"],"upgrade":["SNYK-JS-ELLIPTIC-8172694","SNYK-JS-ELLIPTIC-8187303"],"isBreakingChange":true,"env":"prod","prType":"fix","templateVariants":["updated-fix-title","priorityScore"],"priorityScoreList":[701,828],"remediationStrategy":"vuln"}) --- **Learn how to fix vulnerabilities with free interactive lessons:** 🦉 [Learn about vulnerability in an interactive lesson of Snyk Learn.](https://learn.snyk.io/?loc&#x3D;fix-pr)