KTLN-860: Fixed unit tests

Signed-off-by: Diego Torres <dtorres.py@gmail.com>

Author: diegotorrespy

kotlin-libraries-http/pom.xml

@@ -62,14 +62,15 @@
         <dependency>
             <groupId>com.squareup.retrofit2</groupId>
             <artifactId>retrofit</artifactId>
-            <version>2.9.0</version>
+            <version>${retrofit.version}</version>
         </dependency>
     </dependencies>
 
     <properties>
         <khttp.version>1.3.1</khttp.version>
         <fuel.version>2.3.1</fuel.version>
         <http4k.version>5.25.0.0</http4k.version>
+        <retrofit.version>2.9.0</retrofit.version>
     </properties>
 
 </project>