python3Packages.mkdocs-material: 9.6.15 -> 9.6.16

https://github.com/squidfunk/mkdocs-material/blob/9.6.16/CHANGELOG

This commit was automatically generated using update-python-libraries.

pkgs/development/python-modules/mkdocs-material/default.nix

@@ -28,14 +28,14 @@
 
 buildPythonPackage rec {
   pname = "mkdocs-material";
-  version = "9.6.15";
+  version = "9.6.16";
   pyproject = true;
 
   src = fetchFromGitHub {
     owner = "squidfunk";
     repo = "mkdocs-material";
     tag = version;
-    hash = "sha256-EksLvPl/VfGSufdqgWlQTd6kz07/pTIAOz7hMBdy8Ro=";
+    hash = "sha256-wGzrlDf6bJFIfJXlCMlOQvRlpOcDXeMVY2/GRjOG1H4=";
   };
 
   nativeBuildInputs = [
@@ -60,6 +60,8 @@ buildPythonPackage rec {
     requests
   ];
 
+  pythonRelaxDeps = [ "backrefs" ];
+
   optional-dependencies = {
     recommended = [
       mkdocs-minify-plugin