Update androidx.uiTest to v1.7.8

Author: renovate[bot]

gradle/libs.versions.toml

@@ -4,7 +4,7 @@ kotlin = "2.0.20"
 compose = "1.7.0-beta01"
 agp = "8.5.2"
 androidx-activityCompose = "1.10.1"
-androidx-uiTest = "1.7.0"
+androidx-uiTest = "1.7.8"
 kotlinxCollectionsImmutable = "0.3.8"
 kotlinxDatetime = "0.6.1"
 navigationCompose = "2.8.0-alpha09"