Bump groovy from 2.5.0 to 2.5.8

Bumps [groovy](https://github.com/apache/groovy) from 2.5.0 to 2.5.8.
- [Release notes](https://github.com/apache/groovy/releases)
- [Commits](https://github.com/apache/groovy/commits)

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

Author: dependabot-preview[bot]

modules/jooby-gradle-plugin/pom.xml

@@ -54,7 +54,7 @@
     <dependency>
       <groupId>org.codehaus.groovy</groupId>
       <artifactId>groovy</artifactId>
-      <version>2.5.0</version>
+      <version>2.5.8</version>
       <scope>provided</scope>
     </dependency>