This PR updates the version range for v0.6.0 of the extension API to include v0.7.0. Since we bumped the `zed_extension_api` crate's version to v0.7.0, we need to expand this range in order for Zed clients to be able to install extensions built against v0.7.0 of `zed_extension_api`. Currently no extensions that target `zed_extension_api@0.7.0` can be installed. Release Notes: - N/A