fix: Webhook.send overloads missing ephemeral kwarg

discord/webhook/async_.py

@@ -1611,6 +1611,7 @@ class Webhook(BaseWebhook):
         *,
         username: str = MISSING,
         avatar_url: Any = MISSING,
+        ephemeral: bool = MISSING,
         file: File = MISSING,
         files: Sequence[File] = MISSING,
         allowed_mentions: AllowedMentions = MISSING,
@@ -1630,6 +1631,7 @@ class Webhook(BaseWebhook):
         *,
         username: str = MISSING,
         avatar_url: Any = MISSING,
+        ephemeral: bool = MISSING,
         file: File = MISSING,
         files: Sequence[File] = MISSING,
         allowed_mentions: AllowedMentions = MISSING,