Update dependency catboost to v1.2.6 (#2030)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

requirements-test.txt

@@ -9,6 +9,6 @@ pandas==2.1.3 ; python_version < '3.11'
 pandas==2.2.2 ; python_version >= '3.11'
 xgboost==2.1.1
 lightgbm==4.5.0
-catboost==1.2.5 ; python_version < '3.11' # TODO: Remove 3.11 condition when catboost supports numpy 2.0
+catboost==1.2.6 ; python_version < '3.11' # TODO: Remove 3.11 condition when catboost supports numpy 2.0
 shap==0.46.0
 array-api-strict==1.1.1