Use SMW version 5.1.0 for MW 1.39-1.42 in CI

[paladox]

I don't know if we want to drop MW 1.42 or lower in this extension yet, so just pining the SMW version used for those releases to 5.1.0 for now.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 46.45%. Comparing base (7689c00) to head (0804c59).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #957   +/-   ##
=========================================
  Coverage     46.45%   46.45%           
  Complexity     2326     2326           
=========================================
  Files            80       80           
  Lines          9084     9084           
=========================================
  Hits           4220     4220           
  Misses         4864     4864           

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