Add lower bound (Marshmallow) for testing (#1230)

* add lower bound (Marshmallow) for testing

* spotless

Author: breedx-splk

core/src/integrationTest/kotlin/io/opentelemetry/android/AgentInitTest.kt

@@ -6,6 +6,7 @@
 package io.opentelemetry.android
 
 import android.app.Application
+import android.os.Build.VERSION_CODES.M
 import android.os.Build.VERSION_CODES.UPSIDE_DOWN_CAKE
 import androidx.test.core.app.ApplicationProvider.getApplicationContext
 import androidx.test.ext.junit.runners.AndroidJUnit4
@@ -17,7 +18,7 @@ import org.robolectric.annotation.Config
 
 @RunWith(AndroidJUnit4::class)
 internal class AgentInitTest {
-    @Config(sdk = [UPSIDE_DOWN_CAKE])
+    @Config(sdk = [M, UPSIDE_DOWN_CAKE])
     @Test
     fun startOpenTelemetryRumInAndroid() {
         val application = getApplicationContext<Application>()