Update module golang/mock to v1.4.2

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
github.com/golang/mock	require	patch	v1.4.1 -> v1.4.2

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Release Notes

golang/mock

### [`v1.4.2`](https://togithub.com/golang/mock/releases/v1.4.2) [Compare Source](https://togithub.com/golang/mock/compare/v1.4.1...v1.4.2) - [`f9b4ad1`](https://togithub.com/golang/mock/commit/f9b4ad1) Fix [#​71](https://togithub.com/golang/mock/issues/71) Do + DoAndReturn signature change error msg ([#​395](https://togithub.com/golang/mock/issues/395)) - [`064e67a`](https://togithub.com/golang/mock/commit/064e67a) don't ignore stdout.Write err ([#​410](https://togithub.com/golang/mock/issues/410))

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