Bump androidx.test.ext:junit-ktx from 1.1.5 to 1.2.1

Bumps androidx.test.ext:junit-ktx from 1.1.5 to 1.2.1.

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

Signed-off-by: dependabot[bot] <support@github.com>

gradle/libs.versions.toml

@@ -17,7 +17,7 @@ androidx-test-core = "1.5.0"
 androidx-test-rules = "1.5.0"
 androidx-test-runner = "1.5.2"
 androidx-test-uiautomator = "2.3.0"
-androidx-test-ext-junit = "1.1.5"
+androidx-test-ext-junit = "1.2.1"
 androidx-test-ext-truth = "1.5.0"
 screengrab = "2.1.1"