Bump gson from 2.6.2 to 2.8.5

Bumps [gson](https://github.com/google/gson) from 2.6.2 to 2.8.5.
- [Release notes](https://github.com/google/gson/releases)
- [Changelog](https://github.com/google/gson/blob/master/CHANGELOG.md)
- [Commits](google/gson@gson-parent-2.6.2...gson-parent-2.8.5)

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

Author: dependabot-preview[bot]

build.gradle

@@ -24,7 +24,7 @@ repositories {
 }
 
 dependencies {
-    compile group: 'com.google.code.gson', name: 'gson', version: '2.6.2'
+    compile group: 'com.google.code.gson', name: 'gson', version: '2.8.5'
     compile group: 'commons-io', name: 'commons-io', version: '2.6'
     compile group: 'org.apache.ant', name: 'ant', version: '1.10.7'
     compile group: 'com.beust', name: 'jcommander', version: '1.72'