Release workflow maintenance

[kennethloeffler]

This PR performs a number of relatively straightforward maintenance tasks and improvements for the "Release" workflow:

• Upgrades to actions/checkout@v4 and switches to dtolnay/rust-toolchain instead in favor of actions-rs/toolchain

  Reasoning is the same as Use dtolnay/rust-toolchain and upgrade to checkout v4 in CI workflow #900

• Switches to softprops/create-gh-release

  actions/create-release is unmaintained and has been archived for more than three years.

  I considered using the GitHub CLI's (which is preinstalled on GitHub-hosted runners)gh release create to do this so we wouldn't have to pull in another third-party action, but it requires a checkout first - but doing this only adds a few more seconds before the release is created comapred to create-gh-release, so it may be acceptable?

• Switches to using preinstalled GitHub CLI to upload release archives

  There's absolutely no point in using a third party action for this, so we won't!

• Simplifies the and consolidates the way we generate names for release archives

Here's an example of the results of this workflow on my fork:
https://github.com/kennethloeffler/rojo/actions/runs/8642870695
https://github.com/kennethloeffler/rojo/releases/tag/v7.4.0-releasevvv-workflow-tewstingsbvv

[Dekkonot]

Does using GitHub's CLI for creating a release substantially increase the complexity? Glancing at the docs makes me think no, and it's probably worth using it over an action even if it adds a small delay.

Otherwise, I like the changes and thank you for taking care of this. Touching workflows is always work I want to do but never get around to.

[kennethloeffler]

The command is quite simple, so we may as well do it

Here are the results of this revision:
https://github.com/kennethloeffler/rojo/actions/runs/8657764221 (I had to re-run the macOS ARM job because I got rate limited, but the rest of the artifacts are visible in the previous run)
https://github.com/kennethloeffler/rojo/releases/tag/v7.4.0-release-workflow-testing-2