Bump guava from 27.0.1-jre to 31.1-jre

Bumps [guava](https://github.com/google/guava) from 27.0.1-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:production
...

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

mybatis-plus-extension/build.gradle

@@ -17,5 +17,5 @@ dependencies {
     implementation "${lib.'mybatis-velocity'}"
     implementation "${lib.'mybatis-freemarker'}"
     testImplementation "com.github.pagehelper:pagehelper:5.1.11"
-    testImplementation "com.google.guava:guava:27.0.1-jre"
+    testImplementation "com.google.guava:guava:31.1-jre"
 }