chore(deps): bump ethereum_ssz from 0.5.4 to 0.8.1 in /bolt-sidecar

Bumps [ethereum_ssz](https://github.com/sigp/ethereum_ssz) from 0.5.4 to 0.8.1.
- [Release notes](https://github.com/sigp/ethereum_ssz/releases)
- [Commits](sigp/ethereum_ssz@v0.5.4...v0.8.1)

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

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

bolt-sidecar/Cargo.toml

@@ -24,7 +24,7 @@ tree_hash = "0.5"
 tree_hash_derive = "0.5"
 secp256k1 = { version = "0.29.0", features = ["rand"] }
 ssz_rs = { git = "https://github.com/ralexstokes/ssz-rs", rev = "ec3073e" }
-ethereum_ssz = "0.5"
+ethereum_ssz = "0.8"
 
 # alloy
 alloy = { version = "0.7.2", features = [