chore(deps): update serde_yaml requirement from 0.8 to 0.9

[dependabot[bot]]

Updates the requirements on serde_yaml to permit the latest version.

Release notes

Sourced from serde_yaml's releases.

0.9.2

• Improve Debug representation of serde_yaml::Error

Commits

• 3dd7bcf Release 0.9.2
• 922c18f Merge pull request #296 from dtolnay/debugerror
• 3d62247 Condense Error's Debug format in a way to include whole message
• 26e67d8 Use mark() in the implementation of location()
• 1c031a6 Omit position 0 from error messages
• 3562a13 Split Error display into message_no_mark + mark
• 790becc Fix missing message in Debug of libyaml Error
• bc2f0ca Format with rustfmt 1.5.1-nightly
• 9eca262 Release 0.9.1
• 1d7fc6b Merge pull request #295 from dtolnay/scan
• Additional commits viewable in compare view

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