Versions of wit-bindgen don't match

The version in the project and the version the binding create are off:

```
cargo component --version
cargo-component-component 0.15.0

cargo component new --lib test-version
cd test-version

cat Cargo.toml
[package]
name = "test-version"
version = "0.1.0"
edition = "2021"

[dependencies]
wit-bindgen-rt = { version = "0.29.0", features = ["bitflags"] }

[lib]
crate-type = ["cdylib"]

[profile.release]
codegen-units = 1
opt-level = "s"
debug = false
strip = true
lto = true

[package.metadata.component]
package = "component:test-version"

[package.metadata.component.dependencies]
```

```
cargo component build

head src/bindings.rs
// Generated by `wit-bindgen` 0.25.0. DO NOT EDIT!
// Options used:
#[doc(hidden)]
#[allow(non_snake_case)]
pub unsafe fn _export_hello_world_cabi() -> *mut u8 {
#[cfg(target_arch = "wasm32")]
_rt::run_ctors_once();
let result0 = T::hello_world();
let ptr1 = _RET_AREA.0.as_mut_ptr().cast::();
let vec2 = (result0.into_bytes()).into_boxed_slice();
```

Notice the versions are not the same (`wit-bindgen-rt = { version = "0.29.0",` and `// Generated by `wit-bindgen` 0.25.0. DO NOT EDIT!`

This doesn't seem to cause a problem with current versions, but I think it could?