Upgrade shadowjar to 5.2.0

Bug: 141587937
Bug: 169692487
Change-Id: I96409a8aa11124978d7f3bbefb3378511c5d4956
diff --git a/build.gradle b/build.gradle
index c4e05ea..be4d51e 100644
--- a/build.gradle
+++ b/build.gradle
@@ -22,7 +22,7 @@
         jcenter()
     }
     dependencies {
-        classpath 'com.github.jengelman.gradle.plugins:shadow:4.0.2'
+        classpath 'com.github.jengelman.gradle.plugins:shadow:5.2.0'
     }
 }