chore(deps): bump @blockly/block-test from 3.0.2 to 3.0.3 (google#6777)

Bumps [@blockly/block-test](https://github.com/google/blockly-samples/tree/HEAD/plugins/block-test) from 3.0.2 to 3.0.3.
- [Release notes](https://github.com/google/blockly-samples/releases)
- [Changelog](https://github.com/google/blockly-samples/blob/master/plugins/block-test/CHANGELOG.md)
- [Commits](https://github.com/google/blockly-samples/commits/@blockly/[email protected]/plugins/block-test)

---
updated-dependencies:
- dependency-name: "@blockly/block-test"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>