Updated the process for re-archiving on Datasource.save

[JustinGrilli]

Summary

I believe there is some inefficiency in the re-archiving method of the TableauFile.save functionality.

Change

• Updated the method of re-archiving on TableauFile.save

Tests

• Ran tableau_utilities -l local -n 'datasource' -pn 'Project Name' -f datasource.tdsx datasource --column_name column_name --caption 'New Caption'