Fix test name

Author: 0neel

retrofit-converters/kotlinx-serialization-json/src/test/java/retrofit2/converter/kotlinx/serialization/json/KotlinxJsonSerializationConverterFactoryContextualListTest.kt retrofit-converters/kotlinx-serialization-json/src/test/java/retrofit2/converter/kotlinx/serialization/json/KotlinxSerializationJsonConverterFactoryContextualListTest.kt

@@ -23,7 +23,7 @@ import retrofit2.http.GET
 import retrofit2.http.POST
 
 @OptIn(ExperimentalSerializationApi::class)
-class KotlinxJsonSerializationConverterFactoryContextualListTest {
+class KotlinxSerializationJsonConverterFactoryContextualListTest {
   @get:Rule
   val server = MockWebServer()