Transition to Rust Edition 2024

[abhillman]

• General
  • Review the CONTRIBUTING.md file for
    detailed contributing guidelines before sending a PR.
  • Your contribution is made under the project's copyright
    license.
  • Make sure that your PR is not a duplicate.
  • You have done your changes in a separate branch.
  • You have a descriptive commit message with a short title (first line).
  • You have only one commit. If not, either squash them into one
    commit or contribute your change as a sequence of smaller Pull
    Requests.
• Basic sanity checks
  • You have run runchecks.sh and it said "Everything is OK".
• Testing and Documentation
  • Your changes include unit tests (if they are code changes).
  • If your change relates to the behaviour of the simulator, please
    include comments explaining which part of the reference
    documentation
    describes the thing you're changing.
• If your change is a bugfix and it fully fixes an issue:
  • Put closes #XXXX in your pull request description to
    auto-close the issue that your PR fixes.

If any of the checklist items don't apply, please leave them
un-checked.

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This PR updates the Rust Edition to 2024 per https://doc.rust-lang.org/edition-guide/editions/transitioning-an-existing-project-to-a-new-edition.html.