chore: bump nix flake rust nightly `fmt` overlay

update the rust nightly `fmt` overlay which needs to be pinned
to a specific version (this case by date)

update formatting in main files via `cargo fmt`

1 files changed, 1 insertions, 1 deletions

diff --git a/flake.nix b/flake.nix
index 096727d..a642221 100644
--- a/flake.nix
+++ b/flake.nix
@@ -23,7 +23,7 @@
             # ideally this wouldn't be pinned to a specific nightly version but
             # selectLatestNightlyWith isn't support with mixed toolchains
             # https://github.com/oxalica/rust-overlay/issues/136
-            (lib.hiPrio rust-bin.nightly."2024-09-17".rustfmt)
+            (lib.hiPrio rust-bin.nightly."2024-12-15".rustfmt)
             # (rust-bin.stable.latest.override { extensions = [ "rust-analyzer" ]; })
             rust-bin.stable.latest.default
           ];