Add mu 1.8.5 patch

patches/180331.patch

@@ -0,0 +1,30 @@
+From 2a497f5090dd2487065d1e70c105012b3d595bec Mon Sep 17 00:00:00 2001
+From: Charlotte Van Petegem <charlotte.vanpetegem@ugent.be>
+Date: Wed, 6 Jul 2022 11:43:01 +0200
+Subject: [PATCH] mu: 1.8.3 -> 1.8.5
+
+https://github.com/djcb/mu/releases/tag/v1.8.5
+---
+ pkgs/tools/networking/mu/default.nix | 4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/pkgs/tools/networking/mu/default.nix b/pkgs/tools/networking/mu/default.nix
+index 3e68b54b9b50b..e980c8a76b81b 100644
+--- a/pkgs/tools/networking/mu/default.nix
++++ b/pkgs/tools/networking/mu/default.nix
+@@ -14,13 +14,13 @@
+ 
+ stdenv.mkDerivation rec {
+   pname = "mu";
+-  version = "1.8.3";
++  version = "1.8.5";
+ 
+   src = fetchFromGitHub {
+     owner = "djcb";
+     repo = "mu";
+     rev = "v${version}";
+-    sha256 = "gEqhk600pYHOcYhwr8LGvXHH8KcinX5MbMqYGyYOsnY=";
++    sha256 = "BbH8P5l3zoBKeyFUxJqXIn0sUqg80BApdJCoz+bG/uc=";
+   };
+ 
+   postPatch = ''