[types] Remove BridgeStateCreate and BridgeCommitteeInit variants in EndOfEpochTransactionKind

[miker83z]

Given this PR iotaledger/iota#6863, the EndOfEpochTransactionKind should be adapted to the changes. This means removing the BridgeStateCreate and BridgeCommitteeInit variants (were never used in a live network).

[Thoralf-M]

iota-rust-sdk was updated in #41