Bump keen-client-api-java from 5.2.0 to 5.6.0

Bumps [keen-client-api-java](https://github.com/keenlabs/KeenClient-java) from 5.2.0 to 5.6.0.
- [Release notes](https://github.com/keenlabs/KeenClient-java/releases)
- [Commits](https://github.com/keenlabs/KeenClient-java/commits)

Signed-off-by: dependabot[bot] <support@github.com>

pom.xml

@@ -549,7 +549,7 @@
         <dependency>
             <groupId>io.keen</groupId>
             <artifactId>keen-client-api-java</artifactId>
-            <version>5.2.0</version>
+            <version>5.6.0</version>
             <exclusions>
                 <!-- upper bound fix, git plugin pulls in later versions -->
                 <exclusion>