Update module github.com/stretchr/testify to v1.8.1

This MR contains the following updates:

Package	Type	Update	Change
github.com/stretchr/testify	require	minor	v1.7.1 -> v1.8.1

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Release Notes

stretchr/testify

v1.8.1

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v1.8.0

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v1.7.5

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v1.7.4

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v1.7.3

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v1.7.2

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Configuration

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