[Snyk] Security upgrade mysql2 from 3.5.1 to 3.9.8

[giuseppealbrizio]

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


Snyk has created this PR to fix 1 vulnerabilities in the npm dependencies of this project.

Snyk changed the following file(s):

• package.json
• package-lock.json

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Prototype Pollution SNYK-JS-MYSQL2-6861580	803

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