chore: update dependencies + fix clippy feedback

Author: brocaar

.github/workflows/main.yml

@@ -18,7 +18,7 @@ jobs:
         name: Install Nix
         uses: cachix/install-nix-action@v31
         with:
-          nix_path: nixpkgs=channel:nixos-25.11
+          nix_path: nixpkgs=channel:nixos-26.05
       -
         name: Cargo cache
         uses: actions/cache@v5
@@ -58,7 +58,7 @@ jobs:
         name: Install Nix
         uses: cachix/install-nix-action@v31
         with:
-          nix_path: nixpkgs=channel:nixos-25.11
+          nix_path: nixpkgs=channel:nixos-26.05
       -
         name: Cargo cache
         uses: actions/cache@v5