test: fix downstream to compatible synthetic commit

- downstream used `patchedNix`.
- fix hm compatibility

examples/downstream

@@ -1 +1 @@
-Subproject commit 506079201d113b66aab4c4fa20b2fc397ea890e9
+Subproject commit d21b380999af3e5b97690ec523c44dbc97f57127

flake.lock

@@ -72,11 +72,11 @@
     },
     "flake-utils": {
       "locked": {
-        "lastModified": 1637014545,
-        "narHash": "sha256-26IZAc5yzlD9FlDT54io1oqG/bBoyka+FJk5guaX4x4=",
+        "lastModified": 1638122382,
+        "narHash": "sha256-sQzZzAbvKEqN9s0bzWuYmRaA03v40gaJ4+iL1LXjaeI=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "bba5dcc8e0b20ab664967ad83d24d64cb64ec4f4",
+        "rev": "74f7e4319258e287b0f9cb95426c9853b282730b",
         "type": "github"
       },
       "original": {
@@ -108,30 +108,31 @@
     "home-manager": {
       "inputs": {
         "nixpkgs": [
-          "nixlib"
+          "nixpkgs"
         ]
       },
       "locked": {
-        "lastModified": 1637721183,
-        "narHash": "sha256-4CAKKxrt9l0Hbl57Uypo7ol93Ko+5Yn+7xWWCMUyHQ8=",
+        "lastModified": 1637917557,
+        "narHash": "sha256-3u5bLyGn5NUG3RJA7/v1Bqa/QCFGqp/01Bh/4REf9m4=",
         "owner": "nix-community",
         "repo": "home-manager",
-        "rev": "df931a59a5864d6ff0c5d83598135816f8593647",
+        "rev": "4daff26495ca9ac67476cba8cf15c3e36d91ab18",
         "type": "github"
       },
       "original": {
         "owner": "nix-community",
+        "ref": "release-21.11",
         "repo": "home-manager",
         "type": "github"
       }
     },
     "latest": {
       "locked": {
-        "lastModified": 1637595801,
-        "narHash": "sha256-LkIMwVFKCuEqidaUdg8uxwpESAXjsPo4oCz3eJ7RaRw=",
+        "lastModified": 1638198142,
+        "narHash": "sha256-plU9b8r4St6q4U7VHtG9V7oF8k9fIpfXl/KDaZLuY9k=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "263ef4cc4146c9fab808085487438c625d4426a9",
+        "rev": "8a308775674e178495767df90c419425474582a1",
         "type": "github"
       },
       "original": {
@@ -166,11 +167,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1637913129,
-        "narHash": "sha256-m3KTNPSdKK9E6cVvXwA/Wl2kULUjh32sAl3tLmMBgBE=",
+        "lastModified": 1638222206,
+        "narHash": "sha256-Zds9H5WB+hBjWhag5yWWDDfYOtsAZKa+Hj23bjrmbZI=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "b34d0163e67e425395b4998278bc5f2195c69d48",
+        "rev": "b1cd9a32c2d877d3ae8f17203cc7895272eec688",
         "type": "github"
       },
       "original": {

flake.nix

@@ -15,8 +15,8 @@
       deploy.inputs.nixpkgs.follows = "latest";
       # deploy.inputs.utils.follows = "utils/flake-utils";
 
-      home-manager.url = "github:nix-community/home-manager";
-      home-manager.inputs.nixpkgs.follows = "nixlib";
+      home-manager.url = "github:nix-community/home-manager/release-21.11";
+      home-manager.inputs.nixpkgs.follows = "nixpkgs";
 
       devshell.url = "github:numtide/devshell";
       # fork with urgent fixes that can't be added quickly upstream in respect of upstream user base