Update dependency androidx.test:runner to v1.6.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
androidx.test:runner	1.5.2 -> 1.6.1

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Configuration

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[oldergod]

* What went wrong:
Execution failed for task ':okio-assetfilesystem:processDebugAndroidTestManifest'.
> Manifest merger failed : uses-sdk:minSdkVersion 14 cannot be smaller than version 19 declared in library [androidx.test:runner:1.6.1] /home/runner/.gradle/caches/transforms-3/dd866c24f92d76a04e9255b097405f9a/transformed/runner-1.6.1/AndroidManifest.xml as the library might be using APIs not available in 14
  	Suggestion: use a compatible library with a minSdk of at most 14,
  		or increase this project's minSdk version to at least 19,
  		or use tools:overrideLibrary="androidx.test.runner" to force usage (may lead to runtime failures)