[Snyk] Upgrade yargs from 15.3.1 to 15.4.1

[anthonyvercolano]

Snyk has created this PR to upgrade yargs from 15.3.1 to 15.4.1.

:information_source: Keep your dependencies up-to-date. This makes it easier to fix existing vulnerabilities and to more quickly identify and fix newly disclosed vulnerabilities when they affect your project.

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• The recommended version is 5 versions ahead of your current version.
• The recommended version was released 8 months ago, on 2020-07-10.

The recommended version fixes:

Severity	Issue	PriorityScore (*)	Exploit Maturity
	Prototype Pollution SNYK-JS-Y18N-1021887	472/1000 Why? Proof of Concept exploit, CVSS 7.3	Proof of Concept

(*) Note that the real score may have changed since the PR was raised.

Release notes

Package name: yargs

• 15.4.1 - 2020-07-10
• 15.4.0 - 2020-07-02
• 15.4.0-beta.1 - 2020-07-01
• 15.4.0-beta.0 - 2020-05-15
• 15.3.2-beta.0 - 2020-04-17
• 15.3.1 - 2020-03-16

from yargs GitHub release notes

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[anthonyvercolano]

Not needed