Bump guava from 20.0 to 23.0

Bumps [guava](https://github.com/google/guava) from 20.0 to 23.0.
- [Release notes](https://github.com/google/guava/releases)
- [Commits](google/guava@v20.0...v23.0)

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

Author: dependabot[bot]

build.gradle

@@ -25,7 +25,7 @@ repositories {
 
 dependencies {
     // This dependency is used internally, and not exposed to consumers on their own compile classpath.
-    implementation 'com.google.guava:guava:20.0'
+    implementation 'com.google.guava:guava:23.0'
 
     // Use JUnit test framework
     testImplementation 'junit:junit:4.13'