flake: Update dependencies

flake.lock

@@ -2,11 +2,11 @@
   "nodes": {
     "devshell": {
       "locked": {
-        "lastModified": 1625086391,
-        "narHash": "sha256-IpNPv1v8s4L3CoxhwcgZIitGpcrnNgnj09X7TA0QV3k=",
+        "lastModified": 1630239564,
+        "narHash": "sha256-lv7atkVE1+dFw0llmzONsbSIo5ao85KpNSRoFk4K8vU=",
         "owner": "numtide",
         "repo": "devshell",
-        "rev": "4b5ac7cf7d9a1cc60b965bb51b59922f2210cbc7",
+        "rev": "bd86d3a2bb28ce4d223315e0eca0d59fef8a0a73",
         "type": "github"
       },
       "original": {
@@ -40,11 +40,11 @@
         "rustOverlay": "rustOverlay"
       },
       "locked": {
-        "lastModified": 1628489367,
-        "narHash": "sha256-ADYKHf8aPo1qTw1J+eqVprnEbH8lES0yZamD/yM7RAM=",
+        "lastModified": 1630822133,
+        "narHash": "sha256-CoPUuZvXx690gj5O1EljXNyGInBDfqWC4MOXARMrHog=",
         "owner": "yusdacra",
         "repo": "nix-cargo-integration",
-        "rev": "0dc8383aae5f791a48e34120edb04670b947dc0b",
+        "rev": "e9e445cd6694171a3393df8fd016356baec5742f",
         "type": "github"
       },
       "original": {
@@ -55,11 +55,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1628465643,
-        "narHash": "sha256-QSNw9bDq9uGUniQQtakRuw4m21Jxugm23SXLVgEV4DM=",
+        "lastModified": 1630850248,
+        "narHash": "sha256-OzJi6Olf7mSVhGt3W7qOMVP5Qk1lH60zlHeCcITzfv0=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "6ef4f522d63f22b40004319778761040d3197390",
+        "rev": "23d5823337f4502dfa17e192d8c53a47cabcb6b4",
         "type": "github"
       },
       "original": {
@@ -79,11 +79,11 @@
     "rustOverlay": {
       "flake": false,
       "locked": {
-        "lastModified": 1628475192,
-        "narHash": "sha256-A32shcfPMCll7psCS0OBxVCkA+PKfeWvmU4y9lgNZzU=",
+        "lastModified": 1630808055,
+        "narHash": "sha256-axfnFXuakMyLMlNIr1yVzvC8ipj6nVJnia2YtkWdzYg=",
         "owner": "oxalica",
         "repo": "rust-overlay",
-        "rev": "56a8ddb827cbe7a914be88f4a52998a5f93ff468",
+        "rev": "b4c01ab310031a557b6a00062378535be33c36bb",
         "type": "github"
       },
       "original": {

rust-toolchain.toml

@@ -0,0 +1,3 @@
+[toolchain]
+channel = "nightly"
+# components = ["rustfmt", "rust-src"]