Update all flake.lock files

rust-toolchain/flake.lock

@@ -2,11 +2,11 @@
   "nodes": {
     "flake-utils": {
       "locked": {
-        "lastModified": 1667077288,
-        "narHash": "sha256-bdC8sFNDpT0HK74u9fUkpbf1MEzVYJ+ka7NXCdgBoaA=",
+        "lastModified": 1676283394,
+        "narHash": "sha256-XX2f9c3iySLCw54rJ/CZs+ZK6IQy7GXNY4nSOyu2QG4=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "6ee9ebb6b1ee695d2cacc4faa053a7b9baa76817",
+        "rev": "3db36a8b464d0c4532ba1c7dda728f4576d6d073",
         "type": "github"
       },
       "original": {
@@ -32,11 +32,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1667152175,
-        "narHash": "sha256-ziWAQ+ny5vXP/HKg7Kpon1mB/jZJfLBujb2fnebNXT0=",
+        "lastModified": 1676419747,
+        "narHash": "sha256-VKaecpmFjq3qsG4b7t7UOu2tSTTJKbGHR5f0ICLQT6M=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "a8a8a9e2e74ee76495f56366492c2ab222b8dd2f",
+        "rev": "c9fbcf04164c77ac8a473f984e666d81beef224d",
         "type": "github"
       },
       "original": {
@@ -74,11 +74,11 @@
         "nixpkgs": "nixpkgs_2"
       },
       "locked": {
-        "lastModified": 1667098607,
-        "narHash": "sha256-zTYgUaS+81mNq8Z0v2WYr46ACJFBeWqcQfOVQaTxtNE=",
+        "lastModified": 1676341851,
+        "narHash": "sha256-T8cmSiriXdpZfqlserNyJ1solTCR0DbD8A75epSDOVY=",
         "owner": "oxalica",
         "repo": "rust-overlay",
-        "rev": "de5c4d5d40ae0a0dab67c5f7ae8d26c5445cf00d",
+        "rev": "956ddb5047f98ea08b792b22004b94a9971932c4",
         "type": "github"
       },
       "original": {

rust-toolchain/rust-toolchain.toml

@@ -1,2 +1,2 @@
 [toolchain]
-channel = "1.64.0"
+channel = "1.67.1"