build(deps-dev): bump geckodriver from 1.19.1 to 1.20.0 (#31)

Bumps [geckodriver](https://github.com/vladikoff/node-geckodriver) from 1.19.1 to 1.20.0.
- [Release notes](https://github.com/vladikoff/node-geckodriver/releases)
- [Commits](webdriverio-community/node-geckodriver@v1.19.1...v1.20.0)

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