Remove juju upper constraint

[gnuoy]

No description provided.

[codecov]

Codecov Report

Base: 89.23% // Head: 89.04% // Decreases project coverage by -0.19% ⚠️

Coverage data is based on head (6666d38) compared to base (e7b296e).
Patch coverage: 69.56% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #587      +/-   ##
==========================================
- Coverage   89.23%   89.04%   -0.19%     
==========================================
  Files          44       44              
  Lines        4645     4666      +21     
==========================================
+ Hits         4145     4155      +10     
- Misses        500      511      +11     

Impacted Files	Coverage Δ
zaza/model.py	86.50% <69.56%> (-0.44%)	⬇️
zaza/utilities/__init__.py	90.74% <0.00%> (-7.41%)	⬇️

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