fix argument types passed to RunScript.execute method

When h2 task is configured do create a database and execute scripts
```No signature of method: static org.h2.tools.RunScript.execute() is applicable for argument types: (org.codehaus.groovy.runtime.GStringImpl, java.lang.String, java.lang.String, org.codehaus.groovy.runtime.GStringImpl, java.lang.String, java.lang.Boolean)```
is thrown.