Update p5-MooseX-Types-Structured from version 0.20 to version 0.23.

Pkgsrc changes:
- Adjust dependencies

Upstream changes:
0.23  01 july 2010
        - Changes to the return value of ->validate that hopefully is both
          backwardly compatible as well as more detailed.  Now if you have
          a deeply recursive of repeated type constraints inside other
          type constraints you will get a drill down report to show the
          actual type constraint that failed

0.22  01 June 2010
        - Added tests to demonstrate type constraint equality problem
          introduced in Moose 1.05

0.21  26 March 2010
        - Removed unneed module from test
        - additional contributed documentation fixes

(seb)