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

Author: renovate[bot]

android/gradle/libs.versions.toml

@@ -4,7 +4,7 @@ kotlin = "2.1.0"
 ksp = "2.1.10-1.0.29"
 coreKtx = "1.15.0"
 junit = "4.13.2"
-junitVersion = "1.1.5" # This is to match Compose's version
+junitVersion = "1.2.1" # This is to match Compose's version
 robolectric = "4.14.1"
 roborazzi = "1.40.1"
 espressoCore = "3.5.0" # This is to match Compose's version