Fix duplicate parametrize ID in test_rankby_order

The string "pearsonr" and function sts.pearsonr both resolve to the
same pytest ID. Add explicit id for the function parameter to avoid
collision with strict parametrize IDs.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: PauBadiaM

tests/tl/test_rankby_order.py

@@ -6,7 +6,7 @@
 import decoupler as dc
 
 
-@pytest.mark.parametrize("stat", ["dcor", "pearsonr", "spearmanr", "kendalltau", sts.pearsonr])
+@pytest.mark.parametrize("stat", ["dcor", "pearsonr", "spearmanr", "kendalltau", pytest.param(sts.pearsonr, id="sts.pearsonr")])
 def test_rankby_order(
     tdata,
     stat,