nix: bump nightly in rustup to allow is_multiple_of

Author: querolita

flake.nix

@@ -218,7 +218,7 @@
             checkPhase = if pkgs.stdenv.isDarwin then "" else null;
             text =
               ''
-                if [ "$1" = run ] && { [ "$2" = nightly-2024-06-13 ] || [[ "$2" =~ 1.79-x86_64* ]]; }
+                if [ "$1" = run ] && { [ "$2" = nightly-2025-12-11 ] || [[ "$2" =~ 1.92-x86_64* ]] || [[ "$2" =~ 1.79-x86_64* ]]; }
                 then
                   echo using nix toolchain
                   ${rustup}/bin/rustup run nix "''${@:3}"