👷‍♂️ Upgrade Python Version to `3.11` and Node Version to `18` in CI Files

[sudo rm -rf --no-preserve-root /]

Vyper 0.3.8 will support Python 3.11, see here. We should upgrade the CI Python versions from 3.10 to 3.11 in the CI config files:

• .github/workflows/publish-pypi.yml
• .github/workflows/publish-test-pypi.yml
• .github/workflows/test-contracts.yml

Furthermore, the "" are not needed for the architecture and python-version fields.

Edit: We should also bump the node version to 18.