build(deps): bump xml-rs from 0.8.20 to 0.8.21

[dependabot[bot]]

Bumps xml-rs from 0.8.20 to 0.8.21.

Changelog

Sourced from xml-rs's changelog.

Version 0.8.21

• Added EventWriter::inner_ref
• ~15% performance improvement

Commits

• a885c17 Changelog
• 45a8d09 Bump
• 4ea4c95 Use Eof token
• 2436f5b Const new
• 98da43b Avoid unreachable!()
• 8e77292 Merge pull request #22 from dice-group/feature/eventwriter-inner-ref
• 429d5f0 implement EventWriter::inner_ref
• See full diff in compare view

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 91.95%. Comparing base (cd828a9) to head (311ea09). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #112 +/- ## ======================================= Coverage 91.95% 91.95% ======================================= Files 18 18 Lines 969 969 ======================================= Hits 891 891 Misses 78 78 ```

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