Use sismic >= 1.4.1

[sbidoul]

Fixes #15

[codecov]

Codecov Report

Merging #16 into 11.0 will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##             11.0      #16      +/-   ##
==========================================
+ Coverage   97.23%   97.24%   +<.01%     
==========================================
  Files          14       14              
  Lines         434      435       +1     
==========================================
+ Hits          422      423       +1     
  Misses         12       12

Impacted Files	Coverage Δ
...t_demo_purchase/models/purchase_order_delegated.py	100% <100%> (ø)	⬆️

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