[pyproject.toml] Changing documentation link to master/sphinx

pyproject.toml

@@ -41,7 +41,7 @@
     ]
 
 [project.urls]
-    documentation = "https://www.idiap.ch/software/bob/docs/bob/bob.pad.face/stable/"
+    documentation = "https://www.idiap.ch/software/bob/docs/bob/bob.pad.face/master/sphinx/"
     homepage      = "https://pypi.org/project/bob.pad.face/"
     repository    = "https://gitlab.idiap.ch/bob/bob.pad.face"
     changelog     = "https://gitlab.idiap.ch/bob/bob.pad.face/-/releases"