Bump com.google.guava:guava from 15.0 to 23.0

Bumps [com.google.guava:guava](https://github.com/google/guava) from 15.0 to 23.0.
- [Release notes](https://github.com/google/guava/releases)
- [Commits](google/guava@v15.0...v23.0)

---
updated-dependencies:
- dependency-name: com.google.guava:guava
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

pom.xml

@@ -37,7 +37,7 @@
         <dependency>
             <groupId>com.google.guava</groupId>
             <artifactId>guava</artifactId>
-            <version>15.0</version>
+            <version>23.0</version>
         </dependency>
         <dependency>
             <groupId>io.netty</groupId>