proto: Bump to v0.3.4 (#64372)

This PR bumps the version of the Proto extension to v0.3.4.

Release Notes:

- N/A

Co-authored-by: zed-zippy[bot] <234243425+zed-zippy[bot]@users.noreply.github.com>
Co-authored-by: Finn Evers <finn@zed.dev>

Cargo.lock

@@ -23278,7 +23278,7 @@ dependencies = [
 
 [[package]]
 name = "zed_proto"
-version = "0.3.3"
+version = "0.3.4"
 dependencies = [
  "zed_extension_api 0.7.0",
 ]