as-tree: 0.12.0 -> unstable-2021-03-09

Upstream has not seen any activity in 2 years, this update gets rid of
the patch and makes migration to importCargoLock easier:
https://github.com/NixOS/nixpkgs/pull/217084#discussion_r1111253151.

Diff: https://github.com/jez/as-tree/compare/0.12.0...0036c20f66795774eb9cda3ccbae6ca1e1c19444

pkgs/tools/misc/as-tree/cargo-lock.patch

@@ -1,13 +0,0 @@
-diff --git a/Cargo.lock b/Cargo.lock
-index 991ecd8..9e94574 100644
---- a/Cargo.lock
-+++ b/Cargo.lock
-@@ -11,7 +11,7 @@ dependencies = [
- 
- [[package]]
- name = "as-tree"
--version = "0.11.1"
-+version = "0.12.0"
- dependencies = [
-  "ansi_term",
-  "atty",

pkgs/tools/misc/as-tree/default.nix

@@ -1,27 +1,22 @@
-{ lib, fetchFromGitHub, rustPlatform }:
+{ lib, rustPlatform, fetchFromGitHub }:
 
 rustPlatform.buildRustPackage rec {
   pname = "as-tree";
-  version = "0.12.0";
+  version = "unstable-2021-03-09";
 
   src = fetchFromGitHub {
     owner = "jez";
     repo = pname;
-    rev = version;
-    sha256 = "0c0g32pkyhyvqpgvzlw9244c80npq6s8mxy3may7q4qyd7hi3dz5";
+    rev = "0036c20f66795774eb9cda3ccbae6ca1e1c19444";
+    sha256 = "sha256-80yB89sKIuv7V68p0jEsi2hRdz+5CzE+4R0joRzO7Dk=";
   };
 
-  cargoSha256 = "1m334shcja7kg134b7lnq1ksy67j5b5vblkzamrw06f6r1hkn1rc";
-  # the upstream 0.12.0 release didn't update the Cargo.lock file properly
-  # they have updated their release script, so this patch can be removed
-  # when the next version is released.
-  cargoPatches = [ ./cargo-lock.patch ];
+  cargoSha256 = "sha256-BLEVPKO2YwcKuM/rUeMuyE38phOrbq0e8cjqh1qmJjM=";
 
   meta = with lib; {
     description = "Print a list of paths as a tree of paths";
     homepage = "https://github.com/jez/as-tree";
     license = with licenses; [ blueOak100 ];
     maintainers = with maintainers; [ jshholland ];
-    platforms = platforms.all;
   };
 }