Cardano Updates

Bumps the actions group with 1 update: [slackapi/slack-github-action](https://github.com/slackapi/slack-github-action).


Updates `slackapi/slack-github-action` from 3.0.2 to 3.0.3
- [Release notes](https://github.com/slackapi/slack-github-action/releases)
- [Changelog](https://github.com/slackapi/slack-github-action/blob/main/CHANGELOG.md)
- [Commits](https://github.com/slackapi/slack-github-action/compare/v3.0.2...v3.0.3)

---
updated-dependencies:
- dependency-name: slackapi/slack-github-action
  dependency-version: 3.0.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: actions
...

Signed-off-by: dependabot[bot] <[email protected]>

and use it for `StAnnTx`-signal rules, to accommodate the fact that we
can't have `HasSpec` instance for `StAnnTx`.

to accommodate the fact that we can't have `HasSpec` instance for
`StAnnTx`, as it's a memoized projection against a state.

necessary for tests

instead of `Tx`

In `conwayGovTransition`, we remove the condition on `hardforkConwayBootstrapPhase` for checking `ZeroTreasuryWithdrawals`.

We then replayed the preview, preprod and mainnet public chains with
this change which guarentees there were no empty treasury withdrawals
pre-Conway era.

UTXO with subtransactions

Consolidates golden tests from the separate `cardano-ledger-alonzo-test`
package into the main `cardano-ledger-alonzo` impl package, following the
same pattern already completed in other eras (allegra, mary, conway, babbage).

The `Test.Cardano.Ledger.Alonzo.Binary.Golden.spec` is already getting
called in the `Test.Cardano.Ledger.Alonzo.GoldenSpec` module.

Consolidates golden tests from the separate `cardano-ledger-alonzo-test`
package into the main `cardano-ledger-alonzo` impl package, following the
same pattern already completed in other eras (allegra, mary, conway, babbage).