chore: swap go-eth2-client to ethpandaops fork v0.1.2#828
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Move from github.com/attestantio/go-eth2-client v0.27.1 to github.com/ethpandaops/go-eth2-client v0.1.2. Bumps ethpandaops/beacon and ethpandaops/ethcore to their swap-branch pseudo-versions so the types line up end-to-end. bellatrix/capella ExecutionPayload base fee accessor renamed from BaseFeePerGas to BaseFeePerGasLE in the fork (the field is little-endian 32 bytes). Conversion sites in pkg/proto/eth/block.go and pkg/cannon/deriver/beacon/eth/v2/execution_transaction.go now reverse LE→BE before SetBytes; the previous code passed the LE bytes to big.Int.SetBytes directly, which silently produced wrong values for pre-deneb base fees. Depends on ethpandaops/beacon#72 and ethpandaops/ethcore#127.
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* master: chore: swap go-eth2-client to ethpandaops fork v0.1.2 (#828) feat(output): add s3blobstore sink for blob sidecar archival
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Switches the direct dependency from `github.com/attestantio/go-eth2-client v0.27.1` to `github.com/ethpandaops/go-eth2-client v0.1.2`. Bumps `ethpandaops/beacon` and `ethpandaops/ethcore` to their matching swap-branch pseudo-versions so types align across the call surface.
The fork renamed bellatrix/capella `ExecutionPayload.BaseFeePerGas` ([32]byte) to `BaseFeePerGasLE` to make the byte order explicit. The two affected call sites — `pkg/proto/eth/block.go` and `pkg/cannon/deriver/beacon/eth/v2/execution_transaction.go` — now reverse LE→BE before `big.Int.SetBytes`. The previous code passed the LE bytes to `SetBytes` directly, silently producing wrong base fee values for pre-deneb blocks. Side-effect bug fix.
Depends on ethpandaops/beacon#72 and ethpandaops/ethcore#127 — both must merge (and get tags) before this can move off pseudo-versions.