fix(risc0): Remove call to rustup

Author: Syndamia

packages/risc0/default.nix

@@ -47,7 +47,7 @@ in
       postPatch = ''
         # Replace usages of `Command::new("rustup")` with the correct value
         # which should be used
-        sed -i '82,89d;90ilet path_raw = Some("${rust-toolchain}");' risc0/cargo-risczero/src/toolchain.rs
+        sed -i '44,46d;82,89d;90ilet path_raw = Some("${rust-toolchain}");' risc0/cargo-risczero/src/toolchain.rs
         sed -i '410,417d;663,681d;418ilet rustc = "${rust-toolchain}/bin/rustc";' risc0/build/src/lib.rs
         # Fix starter template
         sed -i 's|{{ risc0_build }}|path = "'$out'"|' risc0/cargo-risczero/templates/rust-starter/methods/Cargo-toml