fix(deps): update dependency solc to v0.8.20

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
solc	0.8.19 -> 0.8.20

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Release Notes

ethereum/solc-js

### [`v0.8.20`](https://togithub.com/ethereum/solc-js/compare/v0.8.19...v0.8.20) [Compare Source](https://togithub.com/ethereum/solc-js/compare/v0.8.19...v0.8.20)

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Configuration

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[coveralls]

Pull Request Test Coverage Report for Build 34d917e89cd24eef7c3c8347ae2be21f218b4aaa-PR-1427

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.02%) to 55.299%

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Totals
Change from base Build ec23de410a7ec9cb6f2ce338d86138021f94bc63:	0.02%
Covered Lines:	3282
Relevant Lines:	5935

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💛 - Coveralls