flake.lock: Update

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/41c7605718399dcfa53dd7083793b6ae3bc969ff' (2023-08-08)
  → 'github:NixOS/nixpkgs/ce5e4a6ef2e59d89a971bc434ca8ca222b9c7f5e' (2023-08-10)
• Updated input 'rust-overlay':
    'github:oxalica/rust-overlay/094512d7a7573ae2cb6db1a5ce4745a69b16fa46' (2023-08-09)
  → 'github:oxalica/rust-overlay/b87a7db512340dea25e95f444db29e9264ff7a63' (2023-08-12)

flake.lock

@@ -20,11 +20,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1691472822,
-        "narHash": "sha256-XVfYZ2oB3lNPVq6sHCY9WkdQ8lHoIDzzbpg8bB6oBxA=",
+        "lastModified": 1691654369,
+        "narHash": "sha256-gSILTEx1jRaJjwZxRlnu3ZwMn1FVNk80qlwiCX8kmpo=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "41c7605718399dcfa53dd7083793b6ae3bc969ff",
+        "rev": "ce5e4a6ef2e59d89a971bc434ca8ca222b9c7f5e",
         "type": "github"
       },
       "original": {
@@ -62,11 +62,11 @@
         "nixpkgs": "nixpkgs_2"
       },
       "locked": {
-        "lastModified": 1691591308,
-        "narHash": "sha256-eeErUrPWCQwFHESL3vpNwkl8oyJPV6SRrVS9cPTEvYI=",
+        "lastModified": 1691806075,
+        "narHash": "sha256-yuq7cNkFOQse4WwLw0rUiXhG58aI6eyXKfcTw5Act/I=",
         "owner": "oxalica",
         "repo": "rust-overlay",
-        "rev": "094512d7a7573ae2cb6db1a5ce4745a69b16fa46",
+        "rev": "b87a7db512340dea25e95f444db29e9264ff7a63",
         "type": "github"
       },
       "original": {