Drop bs4 back down to 4.12.3

This upgrade is suspected to cause the error with the cogs cog we were seeing in #dev-log.
E.G. https://discord.com/channels/267624335836053506/622895325144940554/1344409315556986991

Author: ChrisLovering

poetry.lock

@@ -13,7 +13,7 @@ pydis_core = { version = "11.6.0", extras = ["all"] }
 
 aiohttp = "3.11.12"
 arrow = "1.3.0"
-beautifulsoup4 = "4.13.3"
+beautifulsoup4 = "4.12.3"
 colorama = { version = "0.4.6", markers = "sys_platform == 'win32'" }
 coloredlogs = "15.0.1"
 deepdiff = "7.0.1"