fix invalid escape sequences in QPFunction docstring

- also enable ruff W605 to catch this

Author: fabinsch

bindings/python/proxsuite/torch/qplayer.py

@@ -18,7 +18,7 @@ def QPFunction(
     omp_parallel=False,
     structural_feasibility=True,
 ):
-    """!
+    r"""!
     Solve a batch of Quadratic Programming (QP) problems.
 
     This function solves QP problems of the form:

pyproject.toml

@@ -25,4 +25,5 @@ configure-args = ["-DBUILD_TESTING:BOOL=OFF","-DBUILD_PYTHON_INTERFACE:BOOL=ON",
 
 [tool.ruff.lint]
 ignore = [ "E741" ]
+extend-select = ["W605"]
 exclude = [ "cmake-module/*", "bindings/python/external/nanobind/*" ]