chore: update rust toolchain to 1.85 (#2618)

* chore: update rust toolchain to 1.85

* nix things

* make clippy happy

I've replaced a bunch of &Option<String> with Option<String>.

They were not in hot loops, so a single clone is really no big deal +
keeps things simpler.

* fmt

1 files changed, 1 insertions, 1 deletions

diff --git a/flake.nix b/flake.nix
index 4c9383f0..ec6e7555 100644
--- a/flake.nix
+++ b/flake.nix
@@ -32,7 +32,7 @@
                 fenix.packages.${system}.fromToolchainFile
                   {
                     file = ./rust-toolchain.toml;
-                    sha256 = "sha256-yMuSb5eQPO/bHv+Bcf/US8LVMbf/G/0MSfiPwBhiPpk=";
+                    sha256 = "sha256-AJ6LX/Q/Er9kS15bn9iflkUwcgYqRQxiOIL2ToVAXaU=";
                   };
             in
             pkgs.makeRustPlatform {