Bump fastrlp from 0.3.1 to 0.4.0

Bumps [fastrlp](https://github.com/vorot93/fastrlp) from 0.3.1 to 0.4.0.
- [Commits](https://github.com/vorot93/fastrlp/commits)

---
updated-dependencies:
- dependency-name: fastrlp
  dependency-version: 0.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Cargo.lock

@@ -3,7 +3,7 @@ bip32 = {version = "0.5", default-features = false, features = ["alloc", "secp25
 blake2 = "0.10"
 bytes = "1.10"
 ethereum-types = "0.14"
-fastrlp = {version = "0.3.1", features = ["ethereum-types", "std"]}
+fastrlp = {version = "0.4.0", features = ["ethereum-types", "std"]}
 itertools = "0.14"
 rand = {version = "^0.9", features = ["std", "std_rng"], optional = true}
 reqwest = {version = "0.12", features = ["json"], optional = true}