ref(vcs): Make extract_pr_base_sha_from_event like extract_pr_head_sha_from_event

Author: chromy

src/utils/vcs.rs

@@ -1684,6 +1684,7 @@ mod tests {
     fn test_extract_pr_base_sha_from_event_invalid() {
         extract_pr_base_sha_from_event("invalid json {");
     }
+
     #[test]
     #[serial(github_env)]
     #[should_panic]