build(deps): bump serde_yaml from 0.8.26 to 0.9.21 in /tools

[dependabot]

Bumps serde_yaml from 0.8.26 to 0.9.21.

Release notes

Sourced from serde_yaml's releases.

0.9.21

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

0.9.20

• Allow an empty YAML document to deserialize to None or Value::Null, in addition to the previously supported empty vector, empty map, and struct with no required fields

0.9.19

• Fix message duplication between serde_yaml::Error's Display and source() (#359, #360)

0.9.18

• Add support for emitting Unicode characters over codepoint U+FFFF (#356)

0.9.17

• Improve Debug representation of some error messages

0.9.16

• Opt out of -Zrustdoc-scrape-examples on docs.rs for now

0.9.15

• Documentation improvements

0.9.14

• Implement Deserializer for TaggedValue and &TaggedValue (#339)

0.9.13

• Recognize True, TRUE, False, FALSE as booleans, Null, NULL as null (#330)

0.9.12

• Support deserializing tagged literal scalar into primitive (#327)

  "foo": !!int |-
    7200

0.9.11

• Serialize strings on a single line when they do not already contain a newline character, regardless of string length (#321, #322)

0.9.10

• Make Display for Number produce the same representation as serializing (#316)

0.9.9

• Add serde_yaml::with::singleton_map_recursive

0.9.8

• Fix serialization of TaggedValue when used with to_value (#313)

0.9.7

• Allow an empty plain scalar to deserialize as an empty map or seq (#304)

... (truncated)

Commits

• 8057fad Release 0.9.21
• 19a7bd3 Merge pull request #371 from dtolnay/emptytag
• ebb4b7a Fix deserialization of tag !<%21>
• 879a57f Factor out conversion function from libyaml Tag to tag string
• e3b9a02 Merge pull request #370 from dtolnay/emptytag
• ef43549 Treat Tag::new("!") as tag %21, instead of empty tag
• 221154c Merge pull request #369 from dtolnay/emptytag
• 39a866c Reuse Tag visitor in Value's Deserialize impl
• 80e53a5 Merge pull request #368 from dtolnay/emptytag
• f668f71 Preserve location information better when parsing invalid tag
• Additional commits viewable in compare view

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