chore: CI fixes

src/dynamics/joint/impulse_joint/impulse_joint_set.rs

@@ -215,6 +215,7 @@ impl ImpulseJointSet {
     // }
 
     // #[cfg(not(feature = "parallel"))]
+    #[allow(dead_code)] // That will likely be useful when we re-introduce intra-island parallelism.
     pub(crate) fn joints_mut(&mut self) -> &mut [JointGraphEdge] {
         &mut self.joint_graph.graph.edges[..]
     }

src/dynamics/joint/multibody_joint/multibody.rs

@@ -943,6 +943,7 @@ impl Multibody {
 
     #[cfg(feature = "parallel")]
     #[inline]
+    #[allow(dead_code)] // That will likely be useful when we re-introduce intra-island parallelism.
     pub(crate) fn num_active_internal_constraints_and_jacobian_lines(&self) -> (usize, usize) {
         let num_constraints: usize = self
             .links