zed_extension_api: Use v0.3.0 WIT files for codegen (#25398)

Marshall Bowers created

This PR updates the `zed_extension_api` to use the v0.3.0 WIT files for
code generation.

I missed this in https://github.com/zed-industries/zed/pull/25357.

Release Notes:

- N/A

Change summary

crates/extension_api/src/extension_api.rs | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

Detailed changes