Bump guava from 28.0-jre to 28.1-jre

Bumps [guava](https://github.com/google/guava) from 28.0-jre to 28.1-jre.
- [Release notes](https://github.com/google/guava/releases)
- [Commits](https://github.com/google/guava/commits)

Signed-off-by: dependabot-preview[bot] <[email protected]>

build.gradle

@@ -150,7 +150,7 @@ dependencies {
 
     compile 'org.postgresql:postgresql:42.2.6'
 
-    compile ('com.google.guava:guava:28.0-jre') {
+    compile ('com.google.guava:guava:28.1-jre') {
         // TODO: Remove this as soon as https://github.com/google/guava/issues/2960 is fixed
         exclude module: "jsr305"
     }