feat(manager/gleam): enable update-lockfile

[SnakeDoc]

Changes

Enables lockfile updates

This should not be merged until #31000 is accepted.
#31000 has been merged, we can proceed with this PR.

Context

Supersedes #30811

The Gleam manager does not allow rangeStrategy=update-lockfile

Documentation (please check one with an [x])

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

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

[viceice]

it seems there is a command merged upstream and this PR now needs an update too.

[SnakeDoc]

Yes! Great news, Gleam v1.6.0 landed this feature as a result of gleam-lang/gleam#3602. Gleam v1.6.1 (released today) includes a hotfix that stabilizes this new feature - so we should be good to proceed!

I have a staged changeset on my development branch that I will test tonight. If everything looks good, I'll update this PR and ping it for a fresh review.

[SnakeDoc]

I never know when to trust GH's notifications! Forgive me if this is already in your queue @viceice

[SnakeDoc]

I'm wondering if there's something wrong with this PR, or if everyone is just very busy this time of year? If something is not up to standards, please let me know so I can address it. 🚀

[renovate-release]

🎉 This PR is included in version 39.53.0 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)
• 39.53.0

Your semantic-release bot 📦🚀

[viceice]

ups, forgot to send my review

[SnakeDoc]

Thanks everyone for your help on this PR, and for your patience. It was a long journey, but we made it!

Super eager to get this out into the wild! 🚀