Update dependency androidx.test.ext:junit to v1.2.1

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This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
androidx.test.ext:junit	1.2.0 -> 1.2.1

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Generated by :no_entry_sign: Danger Kotlin against 4ed3553b1a6a8228a0ce0bd9694f50de9a7039da