Use ouroboros-consensus-2.0.0.0

[geo2a]

This PR updates ouroboros-consensus-2.0.0.0 in preparation for the 10.7.2 release of cardano-node.

Changelog

- description: |
    Update ouroboros-consensus to 2.0.0.0 for cardano-node 10.7.2 release
# uncomment types applicable to the change:
  type:
  # - 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
  # - refactoring    # QoL changes
  # - 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...
# uncomment at least one main project this PR is associated with
  projects:
   - cardano-api
  # - cardano-api-gen
  # - cardano-rpc
  # - cardano-wasm

Context

Bumps ouroboros-consensus to 2.0.0.0 as part of the cardano-node 10.7.2 release preparation.

How to trust this PR

Dependency version bump only. CI builds confirm compatibility.

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

[Copilot]

Pull request overview

Updates repository dependency pins/constraints to consume ouroboros-consensus-2.0.0.0 (via CHaP) as part of cardano-node 10.7.2 release preparation.

Changes:

• Bumped ouroboros-consensus dependency bound in cardano-api from ^>=1.0 to ^>=2.0.
• Updated CHaP input revision in flake.lock to a newer commit/hash.
• Advanced cardano-haskell-packages index-state in cabal.project to match the intended snapshot.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
flake.lock	Moves CHaP to a newer locked revision (rev, narHash, lastModified).
cardano-api/cardano-api.cabal	Updates ouroboros-consensus dependency range to allow 2.x (per PVP caret bounds).
cabal.project	Updates CHaP index-state timestamp to a newer snapshot.

[carbolymer]

Is this shipping Ouroboros Darwin? 🤣