chore: remove deprecated code (#125)

Author: BobTheBuidler

eth_portfolio/_loaders/utils.py

@@ -4,7 +4,6 @@
 import msgspec
 from async_lru import alru_cache
 from eth_typing import HexStr
-from eth_utils import to_checksum_address
 from y._decorators import stuck_coro_debugger
 
 
@@ -22,15 +21,3 @@ async def _get_transaction_receipt(txhash: HexStr) -> msgspec.Raw:
     num_workers=1000,
     name=__name__ + ".get_transaction_receipt",
 )
-
-
-def checksum(addr: str) -> str:
-    """We keep a mapping here to save cpu cycles, checksumming is arduous."""
-    try:
-        return __checksums[addr]
-    except KeyError:
-        checksummed = __checksums[addr] = to_checksum_address(addr)
-        return checksummed
-
-
-__checksums = {}