Bump github.com/stretchr/testify from 1.7.0 to 1.8.3

[dependabot[bot]]

Bumps github.com/stretchr/testify from 1.7.0 to 1.8.3.

Commits

• 4c93d8f EqualExportedValues: Handle nested pointer, slice and map fields (#1379)
• 4b2f4d2 add EventuallyWithT assertion (#1264)
• b3106d7 allow testing for functional options (#1023)
• 437071b assert: fix error message formatting for NotContains (#1362)
• c5fc9d6 Compare public elements of struct (#1309)
• f36bfe3 Fix Subset/NotSubset when map is missing keys from the subset (#1261)
• 0ab3ce1 Fix CallerInfo() source file paths (#1288)
• 2b00d33 Fix Call.Unset() panic (issue #1236) (#1250)
• 9acc222 fix: fix bug for check unsafe.Pointer isNil (#1319)
• 1333b5d Add sub-tests to Suite (#1246)
• Additional commits viewable in compare view

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