Update dependency geckodriver to v1.21.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
geckodriver	1.20.0 -> 1.21.0

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Release Notes

vladikoff/node-geckodriver

### [`v1.21.0`](https://togithub.com/vladikoff/node-geckodriver/compare/v1.20.0...v1.21.0) [Compare Source](https://togithub.com/vladikoff/node-geckodriver/compare/v1.20.0...v1.21.0)

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