Bump guava from 18.0 to 23.0 in /plugins/ingest-attachment

Bumps [guava](https://github.com/google/guava) from 18.0 to 23.0.
- [Release notes](https://github.com/google/guava/releases)
- [Commits](google/guava@v18.0...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>

plugins/ingest-attachment/build.gradle

@@ -54,7 +54,7 @@ dependencies {
   api "org.apache.tika:tika-langdetect-optimaize:${versions.tika}"
   // Optimaize libraries/dependencies
   runtimeOnly "com.optimaize.languagedetector:language-detector:0.6"
-  runtimeOnly 'com.google.guava:guava:18.0'
+  runtimeOnly 'com.google.guava:guava:23.0'
   // Other dependencies
   api 'org.tukaani:xz:1.9'
   api 'commons-io:commons-io:2.11.0'