Update the flexmeson windows binary version

The old binary/url is no longer available, and the layout of the
sourceforge archvie seems to have changed to include a new
old_versions/ directory where the previous binary is


While we could use that, it seem better to invest the effort to
adapt the scipt afterwards to use the github archives instead


So for now bump the version to get the subproject building
till we switch to github releases.
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