chore: import JujuVersion from ops.jujuversion instead of model

[IronCore864]

Issue

#638

Solution

Import JujuVersion from ops.jujuversion instead of ops.model.

Current, importing JujuVersion from ops.model works but only because ops.model happens to import JujuVersion from ops.jujuversion. This will be changed soon, so we should import JujuVersionfromops.jujuversion`.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.72%. Comparing base (e760a3d) to head (7fe261c).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #639      +/-   ##
==========================================
+ Coverage   70.71%   70.72%   +0.01%     
==========================================
  Files          11       11              
  Lines        2926     2927       +1     
  Branches      511      511              
==========================================
+ Hits         2069     2070       +1     
  Misses        748      748              
  Partials      109      109              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.