zed_extension_api: Use v0.2.0 WIT types (#17802)

Marshall Bowers created

This PR makes `zed_extension_api` use the WIT types from v0.2.0 of
extension API.

A follow-up from #17795, since I had forgotten to do it there.

Release Notes:

- N/A

Change summary

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

Detailed changes