test: regenerate TestLigrec baselines after per-permutation seeding

[timtreis]

What

Regenerate the three TestLigrec plotting baselines.

Why

#1234 changed permutation tests to spawn per-permutation seeds from a numpy.random.SeedSequence (results now independent of n_jobs/backend, but different for a given seed). The ligrec dot-plot fixtures therefore select a different set of significant interactions, changing the figure dimensions. The stale baselines failed with:

ImageComparisonFailure: Image sizes do not match
  expected (166,237,3) actual (166,252,3)   # test_plot_pvalue_threshold
  expected (390,257,3) actual (390,193,3)   # test_plot_dendrogram_clusters
  expected (152,134,3) actual (166,193,3)   # test_plot_remove_nonsig_interactions

Reproduces on Linux and macOS (data change, not a rendering one), which is why it surfaced in daily integration testing (#1237/#1238/#1239) and on main CI starting at the #1234 commit.

How

Baselines pulled from the failing run's visual_test_results_Linux figure artifacts. The 3 tests pass locally against the new images.

Closes #1237, closes #1238, closes #1239.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.08%. Comparing base (005c905) to head (bf60f47).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1240      +/-   ##
==========================================
+ Coverage   76.81%   77.08%   +0.26%     
==========================================
  Files          63       63              
  Lines        9269     9368      +99     
  Branches     1565     1576      +11     
==========================================
+ Hits         7120     7221     +101     
+ Misses       1547     1545       -2     
  Partials      602      602              

see 2 files with indirect coverage changes

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