Limit scope of google-truth to tests

Change-Id: I856f7177ba05701a8ec8b2e07e1123725f63d3ad

operator/pom.xml

diff --git a/operator/pom.xml b/operator/pom.xml
index 88bc1c1..5ff797e 100644
--- a/operator/pom.xml
+++ b/operator/pom.xml
@@ -244,6 +244,7 @@
 			<groupId>com.google.truth</groupId>
 			<artifactId>truth</artifactId>
 			<version>1.4.4</version>
+			<scope>test</scope>
 		</dependency>
 		<dependency>
 			<groupId>org.junit.jupiter</groupId>