Fix false positives in animated for PartialEmoji.from_str

discord/partial_emoji.py

@@ -94,7 +94,7 @@ class PartialEmoji(_EmojiTag, AssetMixin):
 
     __slots__ = ('animated', 'name', 'id', '_state')
 
-    _CUSTOM_EMOJI_RE = re.compile(r'<?(?P<animated>a)?:?(?P<name>[A-Za-z0-9\_]+):(?P<id>[0-9]{13,20})>?')
+    _CUSTOM_EMOJI_RE = re.compile(r'<?(?:(?P<animated>a)?:)?(?P<name>[A-Za-z0-9\_]+):(?P<id>[0-9]{13,20})>?')
 
     if TYPE_CHECKING:
         id: Optional[int]