CI: update checkout, setup-python, codecov

[ChristianGeng]

Summary

GitHub Actions is deprecating the Node.js 20 runtime used by older
action versions. This bumps the affected actions in this repo's
workflows:

• actions/checkout@v4 -> actions/checkout@v7
• actions/setup-python@v5 -> actions/setup-python@v7
• codecov/codecov-action@v4 -> codecov/codecov-action@v7
  (and renames its file: input to files: in test.yml, since v5+
  dropped the singular form)

Affected files: linter.yml, publish.yml, test.yml.

Note on scope: this repo does not use astral-sh/setup-uv at
all — all installs go through plain pip install — so the
uv-caching bug fix that was part of the sibling PRs in this rollout
does not apply here. This PR is scoped solely to the Node.js 20
action bumps.

This is part of the same CI-action-version rollout applied to:
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, audeering/audmetric#94,
audeering/audmodel#63, audeering/audobject#127,
audeering/audplot#89.

Test plan

• CI passes on this PR (linter, test matrix, docs build/linkcheck)
• Manually verified no other Node.js-20-deprecated action versions
  remain in .github/workflows/
• Confirmed peaceiris/actions-gh-pages@v4 and
  pypa/gh-action-pypi-publish@release/v1 in publish.yml are
  left untouched (already fine, out of scope)

🤖 Generated with Claude Code

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

This PR updates GitHub Actions workflows to use newer action versions that no longer depend on the deprecated Node.js 20 runtime, and adjusts Codecov configuration to match the new action API.

File-Level Changes

Change	Details	Files
Update checkout action versions in all workflows to a Node.js-20-independent release.	Bump actions/checkout from v4 to v7 in test workflow Bump actions/checkout from v4 to v7 in linter workflow Bump actions/checkout from v4 to v7 in publish workflow	.github/workflows/test.yml .github/workflows/linter.yml .github/workflows/publish.yml
Update Python setup action versions in all workflows to a Node.js-20-independent release.	Bump actions/setup-python from v5 to v7 in test matrix workflow Bump actions/setup-python from v5 to v7 in linter workflow Bump actions/setup-python from v5 to v7 in publish workflow	.github/workflows/test.yml .github/workflows/linter.yml .github/workflows/publish.yml
Update Codecov GitHub Action to v7 and align inputs with the new version.	Bump codecov/codecov-action from v4 to v7 in test workflow Rename Codecov input key from file to files in coverage upload step to conform with v5+ API	.github/workflows/test.yml

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