fix: use withdraw4 for Orderbook V6 in intra-orderbook calldata

[Siddharth2207]

Summary

• getCalldata was routing all V4 orders to getCalldataForV4Order, which hardcodes withdraw3 (Orderbook V5)
• Orderbook V6 replaced withdraw3 with withdraw4, causing a revert in the multicall
• Added getCalldataForV4OrderV6 using ABI.Orderbook.V6.Primary.Orderbook with withdraw4 and clear3
• Updated dispatch to check Pair.isV4OrderbookV6 before falling through to the V5 path
• Bumped lib/sushiswap submodule to 1b2b675 (add cbBTC to Base routing bases sushiswap#44) — adds cbBTC to Base routing bases so tokens only paired with cbBTC on Hydrex (e.g. wtMSTR) can be priced in ETH terms

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