update oz to fix encoding issue

[malteish]

This likely did not affect us as we are not deliberately using base64 encoding https://github.com/OpenZeppelin/openzeppelin-contracts/security/advisories/GHSA-9vx6-7xxf-x967

[openzeppelin-code[bot]]

update oz to fix encoding issue

Generated at commit: af480674ecafc5d4bbd7b89245744c7342a62a54

🚨 Report Summary

	Severity Level	Results
Contracts	Critical High Medium Low Note Total	1 2 0 4 26 33
Dependencies	Critical High Medium Low Note Total	0 0 0 0 0 0

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