flake: update dependencies

This reverts commit e20c77650d.

flake.lock

@@ -4,8 +4,8 @@
       "inputs": {
         "artiq-comtools": "artiq-comtools",
         "mozilla-overlay": "mozilla-overlay",
-        "nixpkgs": "nixpkgs",
+        "nixpkgs": "nixpkgs_3",
-        "sipyco": "sipyco",
+        "sipyco": "sipyco_2",
         "src-migen": "src-migen",
         "src-misoc": "src-misoc",
         "src-pythonparser": "src-pythonparser"
@@ -26,14 +26,8 @@
     },
     "artiq-comtools": {
       "inputs": {
-        "nixpkgs": [
+        "nixpkgs": "nixpkgs",
-          "artiq",
+        "sipyco": "sipyco"
-          "nixpkgs"
-        ],
-        "sipyco": [
-          "artiq",
-          "sipyco"
-        ]
       },
       "locked": {
         "lastModified": 1649124276,
@@ -98,6 +92,38 @@
       }
     },
     "nixpkgs": {
+      "locked": {
+        "lastModified": 1653087707,
+        "narHash": "sha256-zfno3snrzZTWQ2B7K53QHrGZwrjnJLTRPalymrSsziU=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "cbd40c72b2603ab54e7208f99f9b35fc158bc009",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-21.11",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1653087707,
+        "narHash": "sha256-zfno3snrzZTWQ2B7K53QHrGZwrjnJLTRPalymrSsziU=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "cbd40c72b2603ab54e7208f99f9b35fc158bc009",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-21.11",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_3": {
       "locked": {
         "lastModified": 1652559422,
         "narHash": "sha256-jPVTNImBTUIFdtur+d4IVot6eXmsvtOcBm0TzxmhWPk=",
@@ -113,6 +139,22 @@
         "type": "github"
       }
     },
+    "nixpkgs_4": {
+      "locked": {
+        "lastModified": 1653087707,
+        "narHash": "sha256-zfno3snrzZTWQ2B7K53QHrGZwrjnJLTRPalymrSsziU=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "cbd40c72b2603ab54e7208f99f9b35fc158bc009",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-21.11",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
     "root": {
       "inputs": {
         "artiq": "artiq",
@@ -122,10 +164,25 @@
     },
     "sipyco": {
       "inputs": {
-        "nixpkgs": [
+        "nixpkgs": "nixpkgs_2"
-          "artiq",
+      },
-          "nixpkgs"
+      "locked": {
-        ]
+        "lastModified": 1651624017,
+        "narHash": "sha256-engReD8l4xzQQJP8BJ7gILUyA1KH5d60lexDVfnoiRM=",
+        "owner": "m-labs",
+        "repo": "sipyco",
+        "rev": "efda015e9994faf6cafc19b239d8e69ca4d26226",
+        "type": "github"
+      },
+      "original": {
+        "owner": "m-labs",
+        "repo": "sipyco",
+        "type": "github"
+      }
+    },
+    "sipyco_2": {
+      "inputs": {
+        "nixpkgs": "nixpkgs_4"
       },
       "locked": {
         "lastModified": 1651624017,