Update flake to 0.11.0 and bump nixpkgs for Go 1.26.3

The release Update Nix Flake job failed because go.mod requires
go >= 1.26.3 (since #42) but the pinned nixpkgs shipped Go 1.26.1,
and Nix builds with GOTOOLCHAIN=local so it can't fetch a newer
toolchain. nix-update couldn't build quien.goModules to compute the
vendor hash.

Bump nixpkgs (13043924 -> 331800de, still github:NixOS/nixpkgs) which
ships Go 1.26.3, and set version 0.11.0 + the matching vendorHash that
the failed automation would have produced. Verified with `nix build
.#quien` (builds clean, reports 0.11.0).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: retlehs

flake.lock

@@ -17,8 +17,8 @@
             {buildGoModule}:
               buildGoModule (finalAttrs: {
                 pname = "quien";
-                version = "0.10.0";
-                vendorHash = "sha256-/uizVtnbjkm4CTVxLECFeqBsBEue5vb7QALA+RbLmSc=";
+                version = "0.11.0";
+                vendorHash = "sha256-aErscLglpLDXH5jxEt6KFDlBH2JjtXDcX4J3YrL5ouI=";
                 src = ./.;
 
                 env.CGO_ENABLED = 0;