fix(deps): update module github.com/plaid/plaid-go to v1.6.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
github.com/plaid/plaid-go	require	minor	v1.4.0 -> v1.6.0

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Release Notes

plaid/plaid-go

### [`v1.6.0`](https://togithub.com/plaid/plaid-go/compare/v1.5.0...v1.6.0) [Compare Source](https://togithub.com/plaid/plaid-go/compare/v1.5.0...v1.6.0) ### [`v1.5.0`](https://togithub.com/plaid/plaid-go/compare/v1.4.0...v1.5.0) [Compare Source](https://togithub.com/plaid/plaid-go/compare/v1.4.0...v1.5.0)

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