fix: update FetchRepositoryLabelsQuery labels type

Author: qkdreyer

Classes/Labels/GitHubClient+RepositoryLabels.swift

@@ -11,8 +11,8 @@ import Apollo
 
 private extension FetchRepositoryLabelsQuery.Data {
 
-    func labels() -> [String] {
-        var labels: [String] = []
+    func labels() -> [RepositoryLabel] {
+        var labels: [RepositoryLabel] = []
         repository?.labels.map { nodes in
             nodes.nodes.map { node in
                 labels += node.compactMap {