zmigrate fails when discovering a transaction with an invalid consensus branch id

I got the following error when attempting to dump a current testnet wallet:
```
λ cargo run --features zcashd -- zcashd ./wallet.dat.20250327 > testnet_wallet.txt
Compiling pqcrypto-internals v0.2.10
Compiling secp256k1-sys v0.10.1
Compiling secp256k1 v0.30.0
Compiling bc-crypto v0.6.0
Compiling bc-shamir v0.5.0
Compiling sskr v0.5.0
Compiling pqcrypto-mlkem v0.1.0
Compiling pqcrypto-mldsa v0.1.1
Compiling bc-components v0.17.0
Compiling bc-envelope v0.24.0
Compiling zewif v0.1.0 (https://github.com/nuttycom/zewif?rev=61c988fbfb6c3e74c5b98ba3da1cbc521b3967bd#61c988fb)
Compiling zewif-zcashd v0.1.0 (https://github.com/nuttycom/zewif-zcashd?rev=dc7825b03e413596fcf301d9918df24dc012c22c#dc7825b0)
Compiling zmigrate v0.1.0 (/home/nuttycom/work/zmigrate)
Finished `dev` profile [unoptimized + debuginfo] target(s) in 7.01s
Running `target/debug/zmigrate zcashd ./wallet.dat.20250327`
[src/zcashd_cmd.rs:32:38] file = "./wallet.dat.20250327"
---
🔴 Error: Parsing Zcashd dump

Caused by: Parsing transaction
Caused by: Parsing consensus_branch_id
Caused by: Unknown consensus branch ID: 928093729
```

This can be avoided by using the consensus branch IDs from the `zcash_protocol` crate, or using the transaction parser from the `zcash_primitives` crate.