Upgrade robolectric to /external/robolectric to prep for removal of /external/robolectric shadows.

Bug: 261728063
Test: atest CarNotificationRoboTests

All tests failing with the same stack before and after.

Change-Id: I22ff56ad6fb14c7d4ab96b3c30dcd14c7edab2be
diff --git a/tests/robotests/Android.bp b/tests/robotests/Android.bp
index f103360..51c6421 100644
--- a/tests/robotests/Android.bp
+++ b/tests/robotests/Android.bp
@@ -24,11 +24,9 @@
     ],
 
     libs: [
-        "Robolectric_all-target",
         "robolectric_android-all-stub",
         "androidx.test.rules",
         "androidx.test.core",
-        "mockito-robolectric-prebuilt",
         "truth-prebuilt",
         "testng",
         "android.car-system-stubs",
@@ -41,4 +39,5 @@
     test_options: {
         timeout: 36000,
     },
+    upstream: true,
 }