Update to swift-collections-benchmark 0.0.2

[lorentey]

This PR bumps the pinned version number of the swift-collections-benchmark dependency to 0.0.2.

(Pinning only takes effect on direct builds of this package, not when the package is merely used as a dependency.)

Checklist

• I've read the Contribution Guidelines
• My contributions are licensed under the Swift license.
• I've followed the coding style of the rest of the project.
• I've added tests covering all new code paths my change adds to the project (if appropriate).
• I've added benchmarks covering new functionality (if appropriate).
• I've verified that my change does not break any existing tests or introduce unexplained benchmark regressions.
• I've updated the documentation if necessary.

[lorentey]

@swift-ci test