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

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

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

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

build.gradle

@@ -42,7 +42,7 @@ buildscript {
         truthVersion = '1.4.2'
         androidXTestRunner = '1.5.2'
         androidXTestRules = '1.5.0'
-        androidXTestExt = '1.1.5'
+        androidXTestExt = '1.2.1'
 
         // Publishing
         nexusStagingPlugin = '0.30.0'