[Snyk] Security upgrade koa-pug from 3.0.0-2 to 4.0.0

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `npm` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • package.json
  • package-lock.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	586/1000 Why? Proof of Concept exploit, Has a fix available, CVSS 5.3	Regular Expression Denial of Service (ReDoS) SNYK-JS-LODASH-1018905	No	Proof of Concept
	681/1000 Why? Proof of Concept exploit, Has a fix available, CVSS 7.2	Command Injection SNYK-JS-LODASH-1040724	No	Proof of Concept
	686/1000 Why? Proof of Concept exploit, Has a fix available, CVSS 7.3	Prototype Pollution SNYK-JS-LODASH-450202	No	Proof of Concept
	636/1000 Why? Proof of Concept exploit, Has a fix available, CVSS 6.3	Prototype Pollution SNYK-JS-LODASH-567746	No	Proof of Concept
	704/1000 Why? Has a fix available, CVSS 9.8	Prototype Pollution SNYK-JS-LODASH-590103	No	No Known Exploit
	686/1000 Why? Proof of Concept exploit, Has a fix available, CVSS 7.3	Prototype Pollution SNYK-JS-LODASH-608086	No	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.

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