docs: workflows: bump prologic/action-markdownlint from 0.28.0 to 0.30.0

[eschabell]

The v0.28.0 action builds its image from a Dockerfile based on
node:24-bullseye-slim. Debian bullseye is archived, so the apt-get
install in that build now 404s on perl-modules-5.32, libperl5.32 and
libnghttp2-14. The build fails before the container starts, so
markdownlint never runs and the check reports failure regardless of
the markdown in the PR.

v0.30.0 uses a prebuilt, digest-pinned image from ghcr.io instead of
building at job time, so no apt-get runs at all. The github_token and
reporter inputs are unchanged.

Signed-off-by: Eric D. Schabell eric@schabell.org

Summary by CodeRabbit

• Chores
  • Updated the Markdown linting workflow to use a newer validation tool version.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: 0347bd33-86cd-465a-9e13-d26d5a8814a1

📥 Commits

Reviewing files that changed from the base of the PR and between 1e9af35 and a6e87dc.

📒 Files selected for processing (1)

• .github/workflows/pr-lint.yaml

Included review availability: Your plan provides up to 2 included reviews per hour; 0 remain after this review.

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📝 Walkthrough

Walkthrough

The pull request updates the pinned prologic/action-markdownlint action in the pull request lint workflow from v0.28.0 to v0.30.0.

Changes

Markdown lint action update

Layer / File(s)	Summary
Update markdown lint workflow action .github/workflows/pr-lint.yaml	The markdownlint job now uses the v0.30.0 action commit instead of the v0.28.0 action commit.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Bug fix

Merge Risk: ⚪ Minimal · up to a6e87

This workflow-only dependency update has no identified user or production impact that blocks merging.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely identifies the workflow action version bump from 0.28.0 to 0.30.0, which is the main change.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[eschabell]

@patrick-stephens this fixes an issue now showing up on #2707, can you review and merge this?

[eschabell]

Closing as the dependabot fix in #2709 solved this.