moz-phab: use substituteInPlace instead of a patch

pkgs/applications/misc/moz-phab/default.nix

@@ -20,11 +20,12 @@ buildPythonApplication rec {
     sha256 = "sha256-uKoMMSp5AIvB1qTRYAh7n1+2dDLneFbssfkfTTshfcs=";
   };
 
-  patches = [
-    # Relax python-hglib requirement
-    # https://phabricator.services.mozilla.com/D131618
-    ./relax-hglib-version.diff
-  ];
+  # Relax python-hglib requirement
+  # https://phabricator.services.mozilla.com/D131618
+  postPatch = ''
+    substituteInPlace setup.py \
+      --replace "==" ">="
+  '';
 
   propagatedBuildInputs = [
     distro

pkgs/applications/misc/moz-phab/relax-hglib-version.diff

@@ -1,13 +0,0 @@
-diff --git a/setup.py b/setup.py
---- a/setup.py
-+++ b/setup.py
-@@ -15,7 +15,7 @@
-     install_requires=[
-         "distro",
-         "glean-sdk>=36.0.0",
--        "python-hglib==2.6.1",
-+        "python-hglib>=2.6.2",
-         "sentry-sdk>=0.14.3",
-         "setuptools",
-     ],
-