[Merged by Bors] - chore: use authenticated gh api in nightly bump workflow

[kim-em]

This PR replaces unauthenticated curl calls to the GitHub API with gh api in the nightly bump workflow. The gh api command automatically uses the app token already generated in the workflow, avoiding transient failures from the unauthenticated rate limit (60 req/hour).

The first attempt of this run failed because the API returned a rate-limit error object instead of the expected array, and jq crashed trying to index it.

Corresponding PRs:

• chore: use authenticated gh api in nightly bump workflow batteries#1678
• chore: use authenticated gh api in nightly bump workflow leanprover/cslib#341

🤖 Prepared with Claude Code

[github-actions]

PR summary 32fe3f9354

Import changes for modified files

No significant changes to the import graph

Import changes for all files

Files	Import difference

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Declarations diff

No declarations were harmed in the making of this PR! 🐙

You can run this locally as follows

## summary with just the declaration names:
./scripts/declarations_diff.sh <optional_commit>

## more verbose report:
./scripts/declarations_diff.sh long <optional_commit>

The doc-module for scripts/declarations_diff.sh contains some details about this script.

---

No changes to technical debt.

You can run this locally as

./scripts/technical-debt-metrics.sh pr_summary

• The relative value is the weighted sum of the differences with weight given by the inverse of the current value of the statistic.
• The absolute value is the relative value divided by the total sum of the inverses of the current values (i.e. the weighted average of the differences).

[bryangingechen]

Thanks!
bors r+

[mathlib-bors]

Pull request successfully merged into master.

Build succeeded:

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