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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Cargo.toml

@@ -6,7 +6,7 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-fantoccini = "0.19.3"
+fantoccini = "0.20.0"
 penguin-config = "0.1.1"
 serde = "1.0.200"
 tokio = { version = "1", features = ["full"] }