Update dependency @ethereumjs/util to v8.1.0 (#271)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
|
[@ethereumjs/util](https://github.com/ethereumjs/ethereumjs-monorepo/tree/master/packages/util#readme)
([source](https://github.com/ethereumjs/ethereumjs-monorepo)) |
[`8.0.6` ->
`8.1.0`](https://renovatebot.com/diffs/npm/@ethereumjs%2futil/8.0.6/8.1.0)
|
[![age](https://badges.renovateapi.com/packages/npm/@ethereumjs%2futil/8.1.0/age-slim)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://badges.renovateapi.com/packages/npm/@ethereumjs%2futil/8.1.0/adoption-slim)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://badges.renovateapi.com/packages/npm/@ethereumjs%2futil/8.1.0/compatibility-slim/8.0.6)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://badges.renovateapi.com/packages/npm/@ethereumjs%2futil/8.1.0/confidence-slim/8.0.6)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>ethereumjs/ethereumjs-monorepo</summary>

###
[`v8.1.0`](https://github.com/ethereumjs/ethereumjs-monorepo/releases/tag/%40ethereumjs/util%408.1.0):
@&#8203;ethereumjs/util v8.1.0

[Compare
Source](https://github.com/ethereumjs/ethereumjs-monorepo/compare/@ethereumjs/[email protected]...@ethereumjs/[email protected])

This release is part of a final planned release round for the current
major EthereumJS release versions, with next major versions planned to
be released in July 2023.

It mainly removes all non-final EIP-4844, KZG and SSZ code from the
libraries (mainly block, tx, util, evm, vm, blockchain) - see PR
[#&#8203;2721](https://github.com/ethereumjs/ethereumjs-monorepo/pull/2721)
- to allow for a clean slate for the current major versions to
transition to maintenance mode. In particular the `@chainsafe/ssz`
dependency is removed from the `@ethereumjs/util` library, which is a
dependency of all other upstream EthereumJS libraries and removal
therefore makes the whole stack lighter again.

If you are interested in continuously following EIP-4844 work have a
look at and follow our upcoming breaking releases where major changes
will be integrated with 4844 nearing a final state.

</details>

---

### Configuration

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♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the
rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update
again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
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---

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runners/ethereumjs/package.json

@@ -6,7 +6,7 @@
   "dependencies": {
     "@ethereumjs/common": "3.2.0",
     "@ethereumjs/evm": "1.4.0",
-    "@ethereumjs/util": "8.0.6",
+    "@ethereumjs/util": "8.1.0",
     "@ethereumjs/vm": "6.4.2",
     "@types/node": "18.16.18",
     "commander": "10.0.1",