[Snyk] Fix for 6 vulnerabilities

[joesalvati68]

Snyk has created this PR to fix 6 vulnerabilities in the npm dependencies of this project.

Snyk changed the following file(s):

• sdk/web-pubsub/arm-webpubsub/package.json

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Regular Expression Denial of Service (ReDoS) SNYK-JS-MOCHA-2863123	192
	Missing Release of Resource after Effective Lifetime SNYK-JS-INFLIGHT-6095116	131
	Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') SNYK-JS-AZUREIDENTITY-7246760	113
	Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') SNYK-JS-AZUREMSALNODE-7246761	85
	Regular Expression Denial of Service (ReDoS) npm:debug:20170905	58
	Regular Expression Denial of Service (ReDoS) SNYK-JS-MINIMATCH-3050818	45

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• Check the changes in this PR to ensure they won't cause issues with your project.
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Learn how to fix vulnerabilities with free interactive lessons:

🦉 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
🦉 Regular Expression Denial of Service (ReDoS)

[joesalvati68]

🎉 Snyk checks have passed. No issues have been found so far.

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