Workflows: fix typo in Task.dependencies name

Task.dependencies had been misspelled as dependenices in the attribute definition, but spelled correctly in constraints definition.

This resulted in Task object have two attributes, dependenices and dependencies.

````
import aaf.fr.workflow.*

  Task.getAll().each {
    println it
    println "    dependencies = " + it.dependencies
    println "    dependenices = " + it.dependenices
  }
````

returns

````
task:[id:1, name:Send confirmation message]
dependencies = []
dependenices = []
task:[id:2, name:Check for valid approvers]
dependencies = []
dependenices = []
task:[id:3, name:Request organization approval]
dependencies = []
dependenices = []
````

Luckily, none of the to versions of the attribute is used and both are empty.  There is also no database mapping - so no database changes needed.

Simple fix by changing the attribute name to the correct form.  All tests passed.