flake: Update

No need for C compiler in development shell + use "packages" to
explicitly refer to devShell packages

flake.lock

@@ -2,11 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1691421349,
-        "narHash": "sha256-RRJyX0CUrs4uW4gMhd/X4rcDG8PTgaaCQM5rXEJOx6g=",
+        "lastModified": 1704290814,
+        "narHash": "sha256-LWvKHp7kGxk/GEtlrGYV68qIvPHkU9iToomNFGagixU=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "011567f35433879aae5024fc6ec53f2a0568a6c4",
+        "rev": "70bdadeb94ffc8806c0570eb5c2695ad29f0e421",
         "type": "github"
       },
       "original": {
@@ -29,11 +29,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1719281921,
-        "narHash": "sha256-LIBMfhM9pMOlEvBI757GOK5l0R58SRi6YpwfYMbf4yc=",
+        "lastModified": 1722910815,
+        "narHash": "sha256-v6Vk/xlABhw2QzOa6xh3Jx/IvmlbKbOazFM+bDFQlWU=",
         "owner": "oxalica",
         "repo": "rust-overlay",
-        "rev": "b6032d3a404d8a52ecfc8571ff0c26dfbe221d07",
+        "rev": "7df2ac544c203d21b63aac23bfaec7f9b919a733",
         "type": "github"
       },
       "original": {

flake.nix

@@ -51,20 +51,20 @@
     in {
       packages.x86_64-linux = {
         inherit thermostat;
+        default = thermostat;
       };
 
       hydraJobs = {
         inherit thermostat;
       };
 
-      devShell.x86_64-linux = pkgs.mkShell {
+      devShells.x86_64-linux.default = pkgs.mkShellNoCC {
         name = "thermostat-dev-shell";
-        buildInputs = with pkgs; [
+        packages = with pkgs; [
           rust openocd dfu-util
           ] ++ (with python3Packages; [
             numpy matplotlib
           ]);
       };
-      defaultPackage.x86_64-linux = thermostat;
     };
 }