Bump guava from 30.1.1-jre to 32.0.0-jre in /agent (#1381)

Bumps [guava](https://github.com/google/guava) from 30.1.1-jre to 32.0.0-jre.
- [Release notes](https://github.com/google/guava/releases)
- [Commits](https://github.com/google/guava/commits)

---
updated-dependencies:
- dependency-name: com.google.guava:guava
  dependency-type: direct:production
...

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agent/pom.xml

@@ -58,7 +58,7 @@
         <gmaven-plugin.version>1.5</gmaven-plugin.version>
         <checkstyle.fails.on.error>true</checkstyle.fails.on.error>
         <slf4j.version>1.7.25</slf4j.version>
-        <guava.version>30.1.1-jre</guava.version>
+        <guava.version>32.0.0-jre</guava.version>
         <wiremock.version>2.16.0</wiremock.version>
     </properties>