flake.nix: Update to 26.05

Also remove radicle-node from the devShell output.

flake.lock

@@ -35,16 +35,16 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1776760124,
-        "narHash": "sha256-rX4LyXNstQYJDywG5w8Qk+M+mn9id2oVNdQHncygf3c=",
+        "lastModified": 1784794680,
+        "narHash": "sha256-5OTS2lnrEoPt+OewzWTw/Td/NN+NhlPtf9ewzrMnvYg=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "3c01be97dcc435a5193fe1071b89fcfe00954959",
+        "rev": "77eb5cde7c72ca1806ebc9411210306484e133a4",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
-        "ref": "release-25.11",
+        "ref": "release-26.05",
         "repo": "nixpkgs",
         "type": "github"
       }

flake.nix

@@ -2,7 +2,7 @@
   description = "Radicle web frontend";
 
   inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs/release-25.11";
+    nixpkgs.url = "github:NixOS/nixpkgs/release-26.05";
     flake-utils.url = "github:numtide/flake-utils";
 
     crane.url = "github:ipetkov/crane";
@@ -192,7 +192,6 @@
         packages = with pkgs; [
           cargo-watch
           nodejs_24
-          radicle-node
           rust-analyzer
           rustToolchain
         ];