Bump androidx.test.ext:junit from 1.2.0 to 1.2.1 (#360)

Bumps androidx.test.ext:junit from 1.2.0 to 1.2.1.

---
updated-dependencies:
- dependency-name: androidx.test.ext:junit
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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