Backport of deps: Update "github.com/hashicorp/go-discover" to v1.5.0 into release/2.0.x

[hc-github-team-nomad-core]

Backport

This PR is auto-generated from #28638 to be assessed for backporting due to the inclusion of the label backport/2.0.x.

The below text is copied from the body of the original PR.

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The update removes the indirect use of "github.com/hashicorp/vic" which has been archived.

Links

https://hashicorp.atlassian.net/browse/SECVULN-58759

Contributor Checklist

• Changelog Entry If this PR changes user-facing behavior, please generate and add a
  changelog entry using the make cl command.
• Testing Please add tests to cover any new functionality or to demonstrate bug fixes and
  ensure regressions will be caught.
• Documentation If the change impacts user-facing functionality such as the CLI, API, UI,
  and job configuration, please update the Nomad product documentation, which is stored in the
  web-unified-docs repo. Refer to the web-unified-docs contributor guide for docs guidelines.
  Please also consider whether the change requires notes within the upgrade
  guide. If you would like help with the docs, tag the nomad-docs team in this PR.
• LLM Usage If an LLM was used to generate any code, please ensure and confirm you have read
  and followed the AI usage guide.

Reviewer Checklist

• Backport Labels Please add the correct backport labels as described by the internal
  backporting document.
• Commit Type Ensure the correct merge method is selected which should be "squash and merge"
  in the majority of situations. The main exceptions are long-lived feature branches or merges where
  history should be preserved.
• Enterprise PRs If this is an enterprise only PR, please add any required changelog entry
  within the public repository.

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Overview of commits

• 77ecda4