build(deps-dev): bump geckodriver from 2.0.3 to 2.0.4 (#367)

Bumps [geckodriver](https://github.com/vladikoff/node-geckodriver) from 2.0.3 to 2.0.4.
- [Release notes](https://github.com/vladikoff/node-geckodriver/releases)
- [Commits](webdriverio-community/node-geckodriver@v2.0.3...v2.0.4)

---
updated-dependencies:
- dependency-name: geckodriver
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]