Update Rust crate serde_yaml to 0.9.21

[kjuulh]

This PR contains the following updates:

Package	Type	Update	Change
serde_yaml	dependencies	patch	0.9.20 -> 0.9.21

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Release Notes

dtolnay/serde-yaml

v0.9.21

Compare Source

• Make Tag::new panic if given empty string, since YAML has no syntax for an empty tag

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[kjuulh]

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