[Snyk] Security upgrade ethers from 4.0.20 to 5.0.0

[zoernert]

Snyk has created this PR to fix 3 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
	Improper Verification of Cryptographic Signature SNYK-JS-ELLIPTIC-7577916	848
	Improper Verification of Cryptographic Signature SNYK-JS-ELLIPTIC-7577917	848
	Improper Verification of Cryptographic Signature SNYK-JS-ELLIPTIC-7577918	848

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[!IMPORTANT]

• Check the changes in this PR to ensure they won't cause issues with your project.
• Max score is 1000. Note that the real score may have changed since the PR was raised.
• This PR was automatically created by Snyk using the credentials of a real user.

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[openzeppelin-code[bot]]

[Snyk] Security upgrade ethers from 4.0.20 to 5.0.0

Generated at commit: 087f66d213861b022276a5406a0a7cf501e929d3

🚨 Report Summary

	Severity Level	Results
Contracts	Critical High Medium Low Note Total	0 0 0 0 0 0
Dependencies	Critical High Medium Low Note Total	0 0 0 0 0 0

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For more details view the full report in OpenZeppelin Code Inspector