Update Rust crate fantoccini to 0.21.0

This MR contains the following updates:

Package	Type	Update	Change
fantoccini	dependencies	minor	0.19.3 -> 0.21.0

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Release Notes

jonhoo/fantoccini (fantoccini)

v0.21.4

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v0.21.3

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v0.21.2

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v0.21.1

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v0.21.0

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v0.20.0

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Configuration

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