Update dependency io.mockk:mockk to v1.13.8 (#1412)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

gradle/libs.versions.toml

@@ -128,7 +128,7 @@ test_junit = "junit:junit:4.13.2"
 test_runner = "androidx.test:runner:1.5.2"
 test_uiautomator = "androidx.test.uiautomator:uiautomator:2.2.0"
 test_junitext = "androidx.test.ext:junit:1.1.5"
-test_mockk = "io.mockk:mockk:1.13.7"
+test_mockk = "io.mockk:mockk:1.13.8"
 test_barista = "com.adevinta.android:barista:4.3.0"
 test_hamcrest = "org.hamcrest:hamcrest:2.2"
 test_orchestrator = "androidx.test:orchestrator:1.4.2"