Cardano Updates

drop support for x86_64-darwin

Nixpkgs expects to drop support for intel macs in 26.11.

Remove --update-proposal-file CLI flag and dead TxUpdateProposal threading

The `_txUpdateProposal` parameter to `runTxBuild` and the matching
read in `runTransactionBuildRawCmd` were both flagged with `TODO`s
to remove them. Update proposals are deprecated since Conway and
the value was never consumed downstream.

This drops the dead bindings, the unused `runTxBuild` parameter,
and the corresponding field destructures, but leaves the CLI flag
(`--update-proposal-file`) and the record fields in
`TransactionBuildCmdArgs` / `TransactionBuildRawCmdArgs` intact, so
this is not a user-visible CLI change.

cardano-api 11.0.0.0 (IntersectMBO/cardano-api#1181) makes
`makeUnsignedTx` error when Plutus scripts are present but protocol
parameters are missing, instead of silently omitting `script_data_hash`.
Two existing tests built Plutus txs without `--protocol-params-file` and
so now fail. Point both at the existing offline-protocol-params-preview.json
fixture used by the other tests in the same module.

cardano-api 11.0.0.0 (IntersectMBO/cardano-api#1181) makes
`makeUnsignedTx` error when Plutus scripts are present but protocol
parameters are missing, instead of silently omitting `script_data_hash`.
Two existing tests built Plutus txs without `--protocol-params-file` and
so now fail. Point both at the existing offline-protocol-params-preview.json
fixture used by the other tests in the same module.

Adapt to the new `Either MakeUnsignedTxError (UnsignedTx ...)` return of
`Exp.makeUnsignedTx` (IntersectMBO/cardano-api#1181). Add a
TxCmdMakeUnsignedTxError constructor to TxCmdError so the error surfaces
with the existing fromEitherCli/firstExceptT idioms, and update the two
call sites in EraBased.Transaction.Run.

Bump the cardano-haskell-packages index-state to pick up cardano-api
11.0.0.0 from CHaP (IntersectMBO/cardano-haskell-packages#1358).

cardano-api 11.0.0.0 (PR #1181) makes `makeUnsignedTx` error when Plutus
scripts are present but protocol parameters are missing, instead of silently
omitting `script_data_hash`. Two existing tests built Plutus txs without
`--protocol-params-file` and so now fail. Point both at the existing
offline-protocol-params-preview.json fixture used by the other tests in
the same module.

Adapt to the new `Either MakeUnsignedTxError (UnsignedTx ...)` return of
`Exp.makeUnsignedTx` (cardano-api PR #1181). Add a TxCmdMakeUnsignedTxError
constructor to TxCmdError so the error surfaces with the existing
fromEitherCli/firstExceptT idioms, and update the two call sites in
EraBased.Transaction.Run.

cardano-api 11.0.0.0 is not yet on CHaP (CHaP PR #1358 is open), so this
adds a temporary source-repository-package pointing at the release tag.
Drop the SRP and bump the cardano-haskell-packages index-state once the
CHaP PR merges.