chore: fix rust-version

halo2_proofs/Cargo.toml

@@ -9,12 +9,14 @@ authors = [
     "Privacy Scaling Explorations team", "Taiko Labs", "Intrinsic Technologies"
 ]
 edition = "2021"
-rust-version = "1.73.0-nightly"
+rust-version = "1.73.0"
 description = """
 Fast PLONK-based zero-knowledge proving system with no trusted setup.
 This is a fork of <https://github.com/privacy-scaling-explorations/halo2>, which is itself a fork of ZCash's "halo2_proofs" crate.
 This fork uses the KZG polynomial commitment scheme for the proving backend.
 Publishing this crate for better versioning in Axiom's production usage.
+
+This crate requires rust nightly to build.
 """
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/axiom-crypto/halo2"