CI: update checkout, setup-python, setup-uv, codecov

[ChristianGeng]

Summary

Two related CI bugs, both caused by stale GitHub Action version pins:

1. Dead uv caching: astral-sh/setup-uv's default cache-dependency-glob
   keys on uv.lock / requirements*.txt, neither of which exists in this
   repo (no committed lockfile, by design). Caching has therefore silently
   never worked. Bumped from v5 to v9.0.0: v6.0.0 added
   pyproject.toml to the default glob, which is committed and changes
   exactly when a dependency does — so caching now works with no lockfile
   needed.

2. Node.js 20 deprecation: actions/checkout@v4, actions/setup-python@v5,
   and the old setup-uv pin all still targeted the deprecated Node 20
   runtime. Bumped checkout and setup-python to v7, and setup-uv's
   v7.0.0 also carries the Node 20 → Node 24 runtime bump.
   codecov/codecov-action@v4 bumped to v7; its v5 rewrite dropped the
   singular file: input in favor of files: (plural) — renamed
   accordingly in test.yml so the coverage upload doesn't silently no-op.
   No actions/cache usage exists in this repo's workflows.

prune-cache left at its new default (off): audmodel's runtime dependencies
(audbackend[all], filelock, oyaml) have no large pre-built binary
wheels like torch, so pruning would save ~0 disk space while costing
avoidable re-downloads.

Test plan

• All four changed workflow YAML files validated with
  uv run --isolated --with pyyaml python3 -c "import yaml; yaml.safe_load(open('FILE'))"
• CI passes on this PR (checkout/setup-python/setup-uv/codecov-action
  bumps exercised across the full test matrix)

Part of the same CI cleanup as audeering/audeer#206,
audeering/opensmile-python#132, audeering/audb#591,
audeering/audformat#539, audeering/audbackend#307,
audeering/audresample#83, audeering/auglib#60, audeering/audonnx#115,
audeering/audinterface#206, audeering/audiofile#193,
audeering/audmath#76, and audeering/audmetric#94.

🤖 Generated with Claude Code

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Updates CI workflows to use newer GitHub Actions versions that run on the Node.js 24 runtime, fixes uv dependency caching by leveraging pyproject.toml, and updates Codecov configuration to match the latest action API so coverage uploads work again.

File-Level Changes

Change	Details	Files
Bump core GitHub Actions (checkout, setup-python) across all workflows to Node.js 24-compatible versions.	Update actions/checkout from v4 to v7 in test, doc, linter, and publish workflows Update actions/setup-python from v5 to v7 in all workflows using Python	.github/workflows/test.yml .github/workflows/doc.yml .github/workflows/linter.yml .github/workflows/publish.yml
Fix uv caching and Node runtime by updating astral-sh/setup-uv.	Update astral-sh/setup-uv from v5 to v9.0.0 in all workflows so default caching includes pyproject.toml and the action runs on Node 24	.github/workflows/test.yml .github/workflows/doc.yml .github/workflows/linter.yml .github/workflows/publish.yml
Update Codecov action configuration so coverage uploads use the new multi-file input API.	Bump codecov/codecov-action from v4 to v7 in the test workflow Rename Codecov input from file to files to match the new action API, ensuring coverage upload no longer no-ops	.github/workflows/test.yml

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