[octocrab] Use CommitAuthor instead of GitUser/Author in Commit (#5)

In #4 , this was changed from Author -> GitUser. Prefer to allow both of these so we can pull user logins for commits without having to guess from their email.

Author: nataliejameson

src/models/commits.rs

@@ -134,7 +134,7 @@ pub enum CommitAuthor {
 #[derive(Debug, Clone, Serialize, Deserialize)]
 #[non_exhaustive]
 pub struct Commit {
-    pub author: Option<GitUser>,
+    pub author: Option<CommitAuthor>,
     pub comments_url: Url,
     pub commit: CommitElement,
     pub committer: Option<ItemGitUser>,