zed_extension_api: Fork new version (#12160)

This PR forks a new version of the `zed_extension_api` in preparation
for some upcoming changes that require breaking changes to the WIT.

Release Notes:

- N/A

---------

Co-authored-by: Max <max@zed.dev>

crates/extension_api/src/extension_api.rs

@@ -140,7 +140,7 @@ pub static ZED_API_VERSION: [u8; 6] = *include_bytes!(concat!(env!("OUT_DIR"), "
 mod wit {
     wit_bindgen::generate!({
         skip: ["init-extension"],
-        path: "./wit/since_v0.0.6",
+        path: "./wit/since_v0.0.7",
     });
 }