chore(docker): bump DIKW_VERSION to v0.6.4

[helebest]

Auto-generated by release.yml after publishing v0.6.4 to PyPI.

The Dockerfile's DIKW_VERSION must match a version already on PyPI
because the Trivy PR-scan job builds the image and pip installs
from PyPI. This PR closes the drift window that opens between the
pyproject.toml version bump and the wheel landing on PyPI.

CI note: when the RELEASE_PR_PAT secret is configured this PR
is opened with it, so ci.yml/Trivy run automatically. If the secret
is unset the PR falls back to the default GITHUB_TOKEN, whose PRs
cannot trigger other workflows — then push an empty commit (or
close/re-open) to run the gate, or (with admin) merge directly
(single-line change; the post-publish guard in reusable-ci.yml
re-validates on the next PR).

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: f92b60cc-3932-4834-b2a3-f7d2192659ba

📥 Commits

Reviewing files that changed from the base of the PR and between 8b4279a and 3fcd62d.

📒 Files selected for processing (1)

• examples/docker/Dockerfile

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/docker-version-v0.6.4

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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