Bump Gleam version to v.1.14

[selwynsimsek]

This change uses the new version v.1.14 of Gleam that was released on December 25, 2025.

Using v.1.13 (as we do currently) causes the benchmark CI workflow to fail, see e.g. a log.

This should hopefully fix the CI which has been broken since then, though I haven't tested the CI myself.

I saw there were some other PRs that discussed updating Gleam, #263 and #292, neither of which were merged.

I decided to make a PR for this manually since I suspect the automated bot got confused because it already made a request in #263 which was then superseded by #292 which was then closed anyway.

As using v.1.13 breaks the speed comparison it seems important to sort out.

Summary by CodeRabbit

• Chores
  • Updated build infrastructure to use Gleam version 1.14.0.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

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Walkthrough

Updated Gleam package version from 1.13.0 to 1.14.0 in two configuration files: the Earthfile Docker image reference and the dagger-poc language configuration.

Changes

Cohort / File(s)	Summary
Gleam version updates Earthfile, dagger-poc/languages.py	Bumped Gleam version from 1.13.0 to 1.14.0 in the base Docker image and nixpkgs language configuration.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'Bump Gleam version to v.1.14' directly and clearly summarizes the main change: updating Gleam from v1.13.0 to v1.14.0 across both the Earthfile and dagger-poc/languages.py.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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