Update dependency buffer to v6

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
buffer	5.7.1 -> 6.0.3

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Release Notes

feross/buffer

### [`v6.0.3`](https://togithub.com/feross/buffer/compare/v6.0.2...v6.0.3) [Compare Source](https://togithub.com/feross/buffer/compare/v6.0.2...v6.0.3) ### [`v6.0.2`](https://togithub.com/feross/buffer/compare/v6.0.1...v6.0.2) [Compare Source](https://togithub.com/feross/buffer/compare/v6.0.1...v6.0.2) ### [`v6.0.1`](https://togithub.com/feross/buffer/compare/v6.0.0...v6.0.1) [Compare Source](https://togithub.com/feross/buffer/compare/v6.0.0...v6.0.1) ### [`v6.0.0`](https://togithub.com/feross/buffer/compare/v5.7.1...v6.0.0) [Compare Source](https://togithub.com/feross/buffer/compare/v5.7.1...v6.0.0)

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