chore(deps-dev): Update veewee/xml requirement from ^2.6 to ^3.1

[dependabot[bot]]

Updates the requirements on veewee/xml to permit the latest version.

Release notes

Sourced from veewee/xml's releases.

Version 3.1.0

What's Changed

• Fix psalm 5.20 by @​veewee in veewee/xml#69
• Attempt to create file and directory when starting a writer for a file by @​veewee in veewee/xml#71

Full Changelog: https://github.com/veewee/xml/compare/3.0.0...3.1.0

Commits

• 7cb255b Merge pull request #71 from veewee/create-while-write-to-file
• 0dffb8d Attempt to create file and directory when starting a writer for a file
• 6fae11b Merge pull request #69 from veewee/psalm-520
• ba9b82e Fix psalm 5.20
• 90affd5 Merge pull request #68 from veewee/drop-deprecations
• d102ab0 Improve opcode cachability for autoloading
• bb3ff4e Drop deprecations
• 1770824 Merge pull request #66 from veewee/reader-improvements
• 143c565 Merge pull request #67 from veewee/shortcut-functions
• eaba15b Add stringify and document element shortcuts to XML Document
• Additional commits viewable in compare view

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