Drop swarmhash support

[r0qs]

This PR removes support for swarm hashes from the binary releases list and updates the Node.js dependency to its latest version in the CI.

Additionally, the PR updates the GitHub Actions to utilize their latest versions. Some of them, such as https://github.com/actions/download-artifact and https://github.com/actions/upload-artifact, were utilizing deprecated versions. Only actions maintained by Github were updated.

actions/upload-artifact@v3 is scheduled for deprecation on November 30, 2024. [Learn more.](https://github.blog/changelog/2024-04-16-deprecation-notice-v3-of-the-artifact-actions/)
Similarly, v1/v2 are scheduled for deprecation on June 30, 2024. Please update your workflow to use v4 of the artifact actions.
This deprecation will not impact any existing versions of GitHub Enterprise Server being used by customers.

Fixes ethereum/solidity#14700

[cameel]

Let's do it.

Like I said on the call, the fact that the position of the IPFS hash changes is a potential problem. But these hashes are probably not that widely used anyway, so I think we can still do it without affecting most tools. We could insert null in place of Swarm's hash, but tools should recognize these URLs based on the protocol and not rely on the position anyway.

Please remember to update the docs though.

[cameel]

By the way, the PR probably needs an update before we merge it, to account for nightlies that were added in the meantime. I rebased it, but now it will probably fail because of those nightlies.

[cameel]

Note that if you come back to this PR tomorrow or later, you'll need to remember to rebase again before merging since we'll have a new nightly by then :)