Upgrade Robolectric dependency to 4.8.1

PiperOrigin-RevId: 446423017

common_library_config.gradle

@@ -29,5 +29,10 @@ android {
         targetCompatibility JavaVersion.VERSION_1_8
     }
 
-    testOptions.unitTests.includeAndroidResources = true
+    testOptions {
+        unitTests.all {
+            jvmArgs "-Xmx2g"
+        }
+        unitTests.includeAndroidResources true
+    }
 }

constants.gradle

@@ -27,7 +27,7 @@ project.ext {
     // https://cs.android.com/android/platform/superproject/+/master:external/guava/METADATA
     guavaVersion = '31.0.1-android'
     mockitoVersion = '3.12.4'
-    robolectricVersion = '4.8-alpha-1'
+    robolectricVersion = '4.8.1'
     // Keep this in sync with Google's internal Checker Framework version.
     checkerframeworkVersion = '3.13.0'
     checkerframeworkCompatVersion = '2.5.5'