test: add missing mock

Author: yknx4

test/lib/services/github/comments_test.exs

@@ -590,6 +590,13 @@ defmodule Librecov.Services.Github.CommentsTests do
       } ->
         json([], status: 200)
 
+      %{
+        method: :get,
+        url: "https://api.github.com/repos/octocat/Hello-World/issues/1347/comments",
+        query: [per_page: 100]
+      } ->
+        json([], status: 200)
+
       %{
         method: :post,
         url: "https://api.github.com/repos/octocat/Hello-World/issues/1347/comments"