Upgrade Groovy to 3.0.6

Author: jericks

README.rst

@@ -136,7 +136,7 @@ Versions
 +-----------+----------+-----------+--------+----------+
 | GeoScript | GeoTools | GeoServer | JTS    | Groovy   |
 +-----------+----------+-----------+--------+----------+
-| 1.17      | 25       | 2.19      | 1.17.1 | 3.0.5    |
+| 1.17      | 25       | 2.19      | 1.17.1 | 3.0.6    |
 +-----------+----------+-----------+--------+----------+
 | 1.16      | 24       | 2.18      | 1.17.1 | 3.0.5    |
 +-----------+----------+-----------+--------+----------+

pom.xml

@@ -568,7 +568,7 @@
     </reporting>
     <properties>
         <gt.version>25-SNAPSHOT</gt.version>
-        <groovy.version>3.0.5</groovy.version>
+        <groovy.version>3.0.6</groovy.version>
     </properties>
     <name>geoscript groovy</name>
     <description>A groovy implementation of geoscript.</description>