[Snyk] Security upgrade node-sass from 4.5.3 to 9.0.0

[jgramoll]

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


Snyk has created this PR to fix 29 vulnerabilities in the yarn dependencies of this project.

Snyk changed the following file(s):

• client/package.json
• client/yarn.lock

Note for zero-installs users

If you are using the Yarn feature 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
	Authentication Bypass SNYK-JS-HAWK-6969142	786
	Prototype Pollution SNYK-JS-LODASH-567746	731
	Prototype Pollution SNYK-JS-LODASH-6139239	696
	Prototype Poisoning SNYK-JS-QS-3153490	696
	Regular Expression Denial of Service (ReDoS) SNYK-JS-SEMVER-3247795	696
	Regular Expression Denial of Service (ReDoS) npm:sshpk:20180409	696
	Prototype Pollution SNYK-JS-LODASH-450202	686
	Prototype Pollution SNYK-JS-LODASH-608086	686
	Prototype Pollution SNYK-JS-LODASH-73638	686
	Prototype Pollution SNYK-JS-LODASHMERGEWITH-174136	686
	Prototype Pollution SNYK-JS-Y18N-1021887	686
	Code Injection SNYK-JS-LODASH-1040724	681
	Uninitialized Memory Exposure npm:stringstream:20180511	646
	Prototype Pollution SNYK-JS-JSONSCHEMA-1920922	644
	Prototype Pollution SNYK-JS-LODASHMERGEWITH-174137	636
	Prototype Pollution npm:hoek:20180212	636
	Prototype Pollution npm:lodash:20180130	636
	Prototype Pollution SNYK-JS-AJV-584908	619
	Prototype Pollution SNYK-JS-MINIMIST-559764	601
	Prototype Pollution SNYK-JS-YARGSPARSER-560381	601
	Regular Expression Denial of Service (ReDoS) SNYK-JS-HOSTEDGITINFO-1088355	586
	Regular Expression Denial of Service (ReDoS) SNYK-JS-LODASH-1018905	586
	Regular Expression Denial of Service (ReDoS) SNYK-JS-HAWK-2808852	584
	Arbitrary File Overwrite SNYK-JS-FSTREAM-174725	579
	Prototype Pollution npm:extend:20180424	579
	Regular Expression Denial of Service (ReDoS) SNYK-JS-LODASH-73639	541
	Regular Expression Denial of Service (ReDoS) npm:tough-cookie:20170905	509
	Prototype Pollution SNYK-JS-MINIMIST-2429795	506
	Regular Expression Denial of Service (ReDoS) SNYK-JS-MINIMATCH-3050818	479

---

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:
🧐 View latest project report
📜 Customise PR templates
🛠 Adjust project settings
📚 Read about Snyk's upgrade logic

---

Learn how to fix vulnerabilities with free interactive lessons:

🦉 Prototype Pollution
🦉 Regular Expression Denial of Service (ReDoS)
🦉 Authentication Bypass
🦉 More lessons are available in Snyk Learn