ci: bump MegaLinter workflow checkout action to v6.0.3

[emsearcy]

Summary

Minor MegaLinter workflow standardization per LFXV2-3338.

• Bump actions/checkout pin from v4.2.2 to v6.0.3, matching other LFX repos.

Everything else in this repo's MegaLinter setup is already exemplary and was left untouched (already on v9.6.0, ACTION_ZIZMOR_UNSECURED_ENV_VARIABLES already configured, and the slsa-github-generator tag-pin + documented zizmor ignore in release.yaml is the reference pattern other repos in this rollout are being aligned to).

Jira

LFXV2-3338

🤖 Generated with GitHub Copilot (via OpenCode)

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 06cc9e3c-87da-4ae9-838f-636511130b34

📥 Commits

Reviewing files that changed from the base of the PR and between 64e0217 and 4b68815.

📒 Files selected for processing (1)

• .github/workflows/mega-linter.yml

Included review availability: 2 reviews are currently available. Your included PR review attempts over the past 7 days set your current allowance at 5 reviews per hour.

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Walkthrough

The Mega-Linter workflow updates its pinned actions/checkout commit from v4.2.2 to v6.0.3.

Changes

Mega-Linter workflow

Layer / File(s)	Summary
Update checkout action pin .github/workflows/mega-linter.yml	The workflow now uses the pinned actions/checkout v6.0.3 commit.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Merge Risk: ⚪ Minimal · up to 4b688

This localized workflow update is merge-ready after normal checks and review, with no actionable merge-blocking risk remaining.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the checkout action update in the MegaLinter workflow.
Description check	✅ Passed	The description directly explains the checkout pin update and its standardization objective.
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.

Full details: Docstring Coverage

Explanation

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 files. (1 skipped: 1 unsupported.)

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch lfxv2-3338-megalinter-upgrade

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_{Comment @coderabbitai help to get the list of available commands.}

[Copilot]

Pull request overview

Updates MegaLinter’s checkout action to the standardized version.

Changes:

• Pins actions/checkout to the valid v6.0.3 commit SHA.

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