Bump xenon from 0.8.0 to 0.9.0

[dependabot[bot]]

Bumps xenon from 0.8.0 to 0.9.0.

Changelog

Sourced from xenon's changelog.

0.9.0 (Feb 24, 2022)

• Update pinned requirements to allow PyYAML v6
• Monkey-patch test module to work around 'paramunittest' issues on Python 3.10

Commits

• 71f39a3 chore: bump to v0.9.0
• e608e79 fix(deps): bump PyYAML requirements
• 35f5af7 fix(tests): monkey-patch collections to work around paramunittest module issue
• e6df26c chore: upgrade to Python 3.10
• 2991cb8 chore: update changelog
• See full diff in compare view

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