Specify the version on dependency to macro crate

Author: alexcrichton

crates/guest-rust/Cargo.toml

@@ -12,7 +12,7 @@ Used when compiling Rust programs to the component model.
 """
 
 [dependencies]
-wit-bindgen-guest-rust-macro = { path = "../guest-rust-macro", optional = true }
+wit-bindgen-guest-rust-macro = { path = "../guest-rust-macro", optional = true, version = "0.3.0" }
 bitflags = { workspace = true }
 
 [features]