ci: bump pipelock SHA pin to v2.4.0

[luckyPipewrench]

Pipelock v2.4.0 tagged 2026-05-09. Bump the SHA-pinned action ref so the verify-python CI Pipelock Scan step runs against the current shipped pipelock.

Changes

• .github/workflows/ci.yml: pin updated from pipelock@7a3b7de... # v2.3.0 to pipelock@9b38f695... # v2.4.0. The new SHA corresponds to git tag v2.4.0 in luckyPipewrench/pipelock.

Not changed

• Verifier package code or runtime behaviour
• Test matrix or Python version coverage
• Conformance corpus

The 0.2.0 EvidenceReceipt v2 work in flight on feat/v0.2.0-evidence-receipt-v2 is unaffected.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 442d3cc5-ec3c-4fe1-b0d5-4c6c6f2dc1cc

📥 Commits

Reviewing files that changed from the base of the PR and between 510bbcd and abe49a8.

📒 Files selected for processing (1)

• .github/workflows/ci.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/bump-pipelock-action-v240

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