nix: Update flake

flake.lock

@@ -40,11 +40,11 @@
         "rustOverlay": "rustOverlay"
       },
       "locked": {
-        "lastModified": 1627940369,
-        "narHash": "sha256-KtY837WKsX9B/pIKFDKzN0wl1t3et1JZjMjGa7SAZxI=",
+        "lastModified": 1628489367,
+        "narHash": "sha256-ADYKHf8aPo1qTw1J+eqVprnEbH8lES0yZamD/yM7RAM=",
         "owner": "yusdacra",
         "repo": "nix-cargo-integration",
-        "rev": "fac8518469e226db4805ff80788979c847b0c322",
+        "rev": "0dc8383aae5f791a48e34120edb04670b947dc0b",
         "type": "github"
       },
       "original": {
@@ -55,11 +55,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1627391865,
-        "narHash": "sha256-tPoWBO9Nzu3wuX37WcnctzL6LoDCErJLnfLGqqmXCm4=",
+        "lastModified": 1628465643,
+        "narHash": "sha256-QSNw9bDq9uGUniQQtakRuw4m21Jxugm23SXLVgEV4DM=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "8ecc61c91a596df7d3293603a9c2384190c1b89a",
+        "rev": "6ef4f522d63f22b40004319778761040d3197390",
         "type": "github"
       },
       "original": {
@@ -79,11 +79,11 @@
     "rustOverlay": {
       "flake": false,
       "locked": {
-        "lastModified": 1627870491,
-        "narHash": "sha256-0Myg04QOIcTN1RhgfRNx0i/iCRyVyf/Z6rJxZUmot5k=",
+        "lastModified": 1628475192,
+        "narHash": "sha256-A32shcfPMCll7psCS0OBxVCkA+PKfeWvmU4y9lgNZzU=",
         "owner": "oxalica",
         "repo": "rust-overlay",
-        "rev": "71d825269cfaa30605d058bd92381be9af87b0be",
+        "rev": "56a8ddb827cbe7a914be88f4a52998a5f93ff468",
         "type": "github"
       },
       "original": {