[e621] support 'e621.cc/posts' URLs (#6809)

https://github.com/mikf/gallery-dl/issues/6809#issuecomment-3043180010

gallery_dl/extractor/e621.py

@@ -75,7 +75,7 @@ class E621Extractor(danbooru.DanbooruExtractor):
 BASE_PATTERN = E621Extractor.update({
     "e621": {
         "root": "https://e621.net",
-        "pattern": r"e621\.net",
+        "pattern": r"e621\.(?:net|cc)",
     },
     "e926": {
         "root": "https://e926.net",

test/results/e621.py

@@ -147,6 +147,12 @@ __tests__ = (
     "#count"   : 15,
 },
 
+{
+    "#url"     : "https://e621.cc/posts?tags=rating:safe",
+    "#category": ("E621", "e621", "tag"),
+    "#class"   : e621.E621TagExtractor,
+},
+
 {
     "#url"     : "https://e621.cc/?tags=rating:safe",
     "#category": ("E621", "e621", "frontend"),