Fix TransactionBuilderError caused by PlutusV2/V3 version mismatch after Aiken upgrade

[Copilot]

Aiken v1.1.21 compiles validators to Plutus V3 by default, but the mint script was still wrapping the compiled UPLC in PlutusV2. This causes an EvaluationError at transaction evaluation time because the node passes a V2-format script context to a V3-compiled script.

Changes

• src/mint.ts: Replace PlutusV2 with PlutusV3 for both the minting policy script and the blackhole address script derivation

- import { PlutusV2 } from "@evolution-sdk/evolution/PlutusV2";
+ import { PlutusV3 } from "@evolution-sdk/evolution/PlutusV3";

  const createScript = (plutus: string, ref: UTxO.UTxO): PlutusV3 => {
    ...
-   return new PlutusV2({ bytes: hexToBytes(scriptHex) });
+   return new PlutusV3({ bytes: hexToBytes(scriptHex) });
  };

The mismatch is confirmed by plutus.json emitting "plutusVersion": "v3" after the Aiken upgrade — the script version wrapping in TypeScript was never updated to match.

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