[Snyk] Security upgrade @openzeppelin/contracts from 4.8.1 to 4.9.6

[carlosfkrause]

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

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
	551/1000 Why? Recently disclosed, Has a fix available, CVSS 5.3	Out-of-bounds Read SNYK-JS-OPENZEPPELINCONTRACTS-6346765	No	No Known Exploit

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

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[Amxx]

This repository only uses interface. It is not affected by this issue.
We should update dependency for @openzeppelin/contracts 5.0(.2), but some events params were renamed, so it requires some code change. Just updating the dependency is breaking, as testing shows.

[ernestognw]

Closing after #60 was merged