dOTC small fix (#1890)

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### Pull Request Checklist:
- [ ] This PR addresses an already opened issue (for bug fixes /
features)
    - This PR fixes #xyz
- [ ] Tests for the changes have been added (for bug fixes / features)
- [ ] (If applicable) Documentation has been added / updated (for bug
fixes / features)
- [x] CHANGELOG.rst has been updated (with summary of main changes)
- [x] Link to issue (:issue:`number`) and pull request (:pull:`number`)
has been added

### What kind of change does this PR introduce?

* Fix an inefficiency in OTC

### Does this PR introduce a breaking change?
No

### Other information:
Bin groups are in the same order as P.
We don't need to find the cell row.

CHANGELOG.rst

@@ -2,6 +2,14 @@
 Changelog
 =========
 
+v0.53.0
+--------------------
+Contributors to this version: Adrien Lamarche (:user:`LamAdr`).
+
+Bug fixes
+^^^^^^^^^
+* Fixed a small inefficiency in ``_otc_adjust`` (:pull:`1890`).
+
 v0.52.0 (2024-08-08)
 --------------------
 Contributors to this version: David Huard (:user:`huard`), Trevor James Smith (:user:`Zeitsperre`), Hui-Min Wang (:user:`Hem-W`), Éric Dupuis (:user:`coxipi`), Sarah Gammon (:user:`SarahG-579462`), Pascal Bourgault (:user:`aulemahal`), Juliette Lavoie (:user:`juliettelavoie`), Adrien Lamarche (:user:`LamAdr`).

xclim/sdba/_adjustment.py

@@ -1031,10 +1031,8 @@ def _otc_adjust(
     rng = np.random.default_rng()
     # The plan row corresponding to a source bin indicates its probabilities to be transported to every target bin
     for i, binX_group in enumerate(binX_groups):
-        # Get the plan row of this bin
-        pi = np.where((binX[binX_group[0]] == gridX).all(1))[0][0]
         # Pick as much target bins for this source bin as there are points in the source bin
-        choice = rng.choice(range(muY.size), p=plan[pi, :], size=binX_count[i])
+        choice = rng.choice(range(muY.size), p=plan[i, :], size=binX_count[i])
         out[binX_group] = (gridY[choice] + 1 / 2) * bin_width + bin_origin
 
     if jitter_inside_bins: