Update web3 requirement from ^6.18.0 to >=6.18,<8.0

Updates the requirements on [web3](https://github.com/ethereum/web3.py) to permit the latest version.
- [Changelog](https://github.com/ethereum/web3.py/blob/main/docs/release_notes.rst)
- [Commits](ethereum/web3.py@v6.18.0...v7.0.0)

---
updated-dependencies:
- dependency-name: web3
  dependency-type: direct:production
...

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

pyproject.toml

@@ -26,7 +26,7 @@ classifiers = [
 
 [tool.poetry.dependencies]
 python = ">=3.9,<4.0"
-web3 = "^6.18.0"
+web3 = ">=6.18,<8.0"
 
 [tool.poetry.group.dev.dependencies]
 pytest = "^8.2.0"