Integrate cardano-ledger and ouroboros-consensus for node-8.11.0

[Lucsanszky]

Changelog

- description: |
    Updated `cardano-ledger`, `ouroboros-consensus` and `plutus` packages.
    Added `FailT` dependency.
    Updated `conwayGenesisDefaults` and `alonzoGenesisDefaults`.
    Changed `CostModel` to use `Int64` instead of `Integer`.
    Fixed `ProtocolParameters` golden test to account for the `Integer` -> `Int64` change in the `CostModel`.
# uncomment types applicable to the change:
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  # - feature        # introduces a new feature
  - breaking       # the API has changed in a breaking way
  # - compatible     # the API has changed but is non-breaking
  # - optimisation   # measurable performance improvements
  # - improvement    # QoL changes e.g. refactoring
  # - bugfix         # fixes a defect
  - test           # fixes/modifies tests
  # - maintenance    # not directly related to the code
  - release        # related to a new release preparation
  # - documentation  # change in code docs, haddocks...

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Checklist

• Commit sequence broadly makes sense and commits have useful messages
• New tests are added if needed and existing tests are updated. See Running tests for more details
• Self-reviewed the diff