openvswitch: 3.0.3 -> 3.1.1

pkgs/os-specific/linux/openvswitch/default.nix

···
 import ./generic.nix {
-  version = "3.0.3";
-  hash = "sha256-9QZlCnbx8s7737WD80NBIQLxcKvFXG/4dWd5Jrm9lGM=";
+  version = "3.1.1";
+  hash = "sha256-YEiRg6RNO5WlUiQHIhfF9tN6oRvhKnV2JRDO25Ok4gQ=";
 }

pkgs/os-specific/linux/openvswitch/generic.nix

···
   '';
 
   doCheck = true;
+  preCheck = ''
+    patchShebangs tests/
+  '';
 
   nativeCheckInputs = [
     iproute2