Update nixpkgs to 25.11 (and Rust to 1.91.1)

Author: valentinegb

Cargo.toml

@@ -40,8 +40,8 @@ poise = { git = "https://github.com/serenity-rs/poise.git", rev = "518ff0564865b
 
 [workspace.package]
 edition = "2024"
-# Latest version available on nixos-25.05
-rust-version = "1.89"
+# Latest version available on nixos-25.11
+rust-version = "1.91"
 
 [workspace.dependencies]
 monetization.path = "crates/monetization"

flake.lock

@@ -18,7 +18,7 @@
 
 {
   inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.05";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.11";
   };
 
   outputs =
@@ -28,7 +28,7 @@
       packages =
         nixpkgs.lib.genAttrs (nixpkgs.lib.remove "x86_64-freebsd" nixpkgs.lib.systems.flakeExposed)
           (system: {
-            goober-bot = nixpkgs.legacyPackages.${system}.rustPackages_1_89.rustPlatform.buildRustPackage {
+            goober-bot = nixpkgs.legacyPackages.${system}.rustPlatform.buildRustPackage {
               pname = "goober-bot";
               version = (builtins.fromTOML (builtins.readFile ./Cargo.toml)).package.version;
               src = ./.;