Add mu 1.8.1 patch

patches/179166.patch

@@ -0,0 +1,30 @@
+From c5bfe11d1114e7b9e9ed1dcb66b04ece3464ee3e Mon Sep 17 00:00:00 2001
+From: Charlotte Van Petegem <charlotte@vanpetegem.me>
+Date: Sun, 26 Jun 2022 11:20:40 +0200
+Subject: [PATCH] mu: 1.8.0 -> 1.8.1
+
+https://github.com/djcb/mu/releases/tag/v1.8.1
+---
+ 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 b218a19154a5ca..ec5b13b34f26e8 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 = "1.8.0";
++  version = "1.8.1";
+ 
+   src = fetchFromGitHub {
+     owner  = "djcb";
+     repo   = "mu";
+     rev    = "v${version}";
+-    sha256 = "rb8R04eU/rG7PXx/horYk0+/3AgbxYYZtxy4ACILOZ8=";
++    sha256 = "dFYITyO9znocf9fv3eh2h83NM3RDYcpDV/uxOISChZo=";
+   };
+ 
+   postPatch = ''