Bump com.google.guava:guava from 11.0 to 23.0 in /pig

Bumps [com.google.guava:guava](https://github.com/google/guava) from 11.0 to 23.0.
- [Release notes](https://github.com/google/guava/releases)
- [Commits](google/guava@v11.0...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] <support@github.com>

pig/build.gradle

@@ -36,7 +36,7 @@ dependencies {
     testImplementation("com.fasterxml.jackson.core:jackson-databind:2.7.8")
     testImplementation("org.apache.pig:pig:$pigVersion:$pigClassifier")
     testImplementation("joda-time:joda-time:$jodaVersion")
-    testImplementation("com.google.guava:guava:11.0")
+    testImplementation("com.google.guava:guava:23.0")
     testImplementation("jline:jline:0.9.94")
 
     itestEmbedded(project(":test:shared"))