chore: upgrade rust-toolchain to 1.74.0

crates/tests/src/capsule.rs

@@ -65,7 +65,7 @@ fn test_build<P: AsRef<Path>>(
         .arg("-c")
         .arg(format!("{} build --host", bin_path))
         // This will be a the rust toolchain used to build this test, but we
-        // want cross to use the one in {contracts_path}/rust-toolchain.
+        // want cross to use the one in {contracts_path}/rust-toolchain.toml.
         .env_remove("RUSTUP_TOOLCHAIN")
         .spawn()?
         .wait()?;

rust-toolchain.toml

@@ -0,0 +1,3 @@
+[toolchain]
+profile = "default"
+channel = "1.74.0"

src/generator/mod.rs

@@ -65,7 +65,7 @@ fn gen_project_layout<P: AsRef<Path>>(name: String, project_path: P) -> Result<(
     for (f, template_name) in &[
         ("capsule.toml", None),
         ("README.md", None),
-        ("rust-toolchain", None),
+        ("rust-toolchain.toml", None),
         ("Cross.toml", None),
         ("Cargo.toml", Some("Cargo-manifest.toml")),
         (".gitignore", None),

templates/rust-toolchain.toml

@@ -0,0 +1,3 @@
+[toolchain]
+profile = "default"
+channel = "1.74.0"