Bump web3 from 6.19.0 to 6.20.0

Bumps [web3](https://github.com/ethereum/web3.py) from 6.19.0 to 6.20.0.
- [Changelog](https://github.com/ethereum/web3.py/blob/v6.20.0/docs/release_notes.rst)
- [Commits](ethereum/web3.py@v6.19.0...v6.20.0)

---
updated-dependencies:
- dependency-name: web3
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements.txt

@@ -8,4 +8,4 @@ py-evm==0.10.1b1
 pysha3>=1.0.0,<2.0.0; python_version<"3.9"
 requests==2.32.3
 safe-pysha3>=1.0.0; python_version>="3.9"
-web3==6.19.0
+web3==6.20.0