build(deps): update fvm_ipld_encoding requirement from 0.4.0 to 0.5.1

Updates the requirements on [fvm_ipld_encoding](https://github.com/filecoin-project/ref-fvm) to permit the latest version.
- [Changelog](https://github.com/filecoin-project/ref-fvm/blob/master/doc/testnet-release-process.md)
- [Commits](https://github.com/filecoin-project/ref-fvm/compare/fvm_ipld_encoding@v0.4.0...fvm_ipld_encoding@v0.5.1)

---
updated-dependencies:
- dependency-name: fvm_ipld_encoding
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Cargo.toml

@@ -11,6 +11,6 @@ edition = "2021"
 [workspace.dependencies]
 ahash = "0.8.11"
 anyhow = "1.0"
-fvm_ipld_encoding = "0.4.0"
+fvm_ipld_encoding = "0.5.1"
 keccak-hash = "0.11.0"
 thiserror = "2.0.6"