feat(hex): support update-lockfile strategy

[pdm-jd]

Changes

• Support rangeStrategy=update-lockfile for the mix manager
• Fixed fixture mix.exs to have a realistic structure - no duplicate dependencies with different versions

Context

Closes #13618

Depends on #27924

Documentation (please check one with an [x])

• I have updated the documentation, or
• No documentation update is required

It looks like the documentation for Hex versioning should automatically update to include update-lockfile, based on tools/docs/versioning.ts

How I've tested my work (please select one)

I have verified these changes via:

• Code inspection only, or
• Newly added/modified unit tests, or
• No unit tests but ran on a real repository, or
• Both unit tests + ran on a real repository

Example PRs created with this code for these dependencies https://github.com/pdm-jd/renovate-mix-tests/pulls

  defp deps do
    [
      {:tesla, "~> 1.4"},
      {:poison, "~> 4.0"}
    ]
  end

[viceice]

please split this PR in a manager and a versioning part.

[pdm-jd]

please split this PR in a manager and a versioning part.

@viceice to confirm, would you like me to close this one and submit two PRs that reference this one?

[viceice]

no, just create one new PR with the changes which need to be merged first. currently don't see if it's versioning or manager, so decide yourself.

[viceice]

blocked by #27924

[pdm-jd]

This is ready for re-review. I've validated it still works as expected with the code.

Reference: https://github.com/pdm-jd/renovate-mix-tests/pulls

[renovate-release]

🎉 This PR is included in version 37.405.0 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)
• 37.405.0

Your semantic-release bot 📦🚀