Update Docker used in CI templates to 19.03.15 [RUN ALL RSPEC] [RUN AS-IF-FOSS]

What does this MR do?

Updates Docker used in CI templates to 19.03.15 to address CVE-2021-21285/CVE-2021-21284/CVE-2020-15257.

Upstream full diff: docker/docker-ce@v19.03.11...v19.03.15 (moby/moby@v19.03.11...v19.03.15 for the future when docker/docker-ce is deprecated)

Screenshots (strongly suggested)

n/a

Does this MR meet the acceptance criteria?

Conformity

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  • I have included a changelog entry.
• Code review guidelines
• Style guides
• Separation of EE specific content

Closes #328208