[Snyk] Security upgrade @openzeppelin/contracts from 2.5.1 to 3.4.0

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `yarn` 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
  • yarn.lock

• Adding or updating a Snyk policy (.snyk) file; this file is required in order to apply Snyk vulnerability patches. Find out more.

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	539/1000 Why? Has a fix available, CVSS 6.5	Improper Synchronization SNYK-JS-OPENZEPPELINCONTRACTS-1065254	Yes	No Known Exploit

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

With a Snyk patch:

Severity	Priority Score (*)	Issue	Exploit Maturity
	636/1000 Why? Proof of Concept exploit, Has a fix available, CVSS 6.3	Prototype Pollution SNYK-JS-LODASH-567746	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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