SLING-9288 Update Pax Exam to 4.13.3

* Add missing OSGi Configuration Admin dependency
diff --git a/pom.xml b/pom.xml
index d271cec..e1a215b 100644
--- a/pom.xml
+++ b/pom.xml
@@ -107,6 +107,11 @@
     </dependency>
     <dependency>
       <groupId>org.osgi</groupId>
+      <artifactId>org.osgi.service.cm</artifactId>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.osgi</groupId>
       <artifactId>org.osgi.service.http</artifactId>
       <version>1.2.1</version>
       <scope>test</scope>