refactor(contracts): update solidity version in contracts

[vplasencia]

Description

This PR updates the Solidity version in remaining contracts for consistency.

Related Issue(s)

Re #999

Checklist

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have run yarn format and yarn lint without getting any errors
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

Important

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[openzeppelin-code]

refactor(contracts): update solidity version in contracts

Generated at commit: 0b4b74a9f99f2ac22ef0697c004188a6a86b065c

🚨 Report Summary

	Severity Level	Results
Contracts	Critical High Medium Low Note Total	0 0 0 5 15 20
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