Bump guava from 29.0-jre to 31.1-jre

Bumps [guava](https://github.com/google/guava) from 29.0-jre to 31.1-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:development
...

Signed-off-by: dependabot[bot] <support@github.com>

pom.xml

@@ -63,7 +63,7 @@
     <license>apache_v2</license>
     <debug>false</debug>
     <java.level>1.8</java.level>
-    <guava.version>29.0-jre</guava.version>
+    <guava.version>31.1-jre</guava.version>
     <assertj-core.version>3.16.1</assertj-core.version>
     <commons-io.version>2.7</commons-io.version>
   </properties>