Update dependency org.robolectric:robolectric to v4.7.3

Author: renovate-bot

build.gradle

@@ -9,7 +9,7 @@ buildscript {
         androidXWebKitVersion = "1.4.0"
         androidXTestVersion = "1.3.0"
         junitVersion = "4.13.2"
-        robolectricVersion = '4.5.1'
+        robolectricVersion = '4.7.3'
     }
     repositories {
         google()