Update dependency deptry to ^0.21.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
deptry (changelog)	^0.20.0 -> ^0.21.0

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Release Notes

fpgmaas/deptry (deptry)

v0.21.1

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Bug Fixes

• Handle string requirements files for setuptools dynamic
  dependencies (#​945)

Full Changelog

v0.21.0

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Breaking changes

Ignore files handling

Unless --exclude is used, deptry excludes files found in common ignore
files (.gitignore, .ignore, $HOME/.config/git/ignore. ...), by using ignore
Rust crate. The default behaviour has been changed, so that now:

• git-related ignore rules (.gitignore, $HOME/.config/git/ignore, ...) are only used if deptry is run inside a git
  repository
• .gitignore files that are in parent directories of the git repository from where deptry is run are not
  used (previously, deptry would traverse parent directories up to the root system)

If you were using .gitignore files for non-git repositories, you might want to switch to .ignore files, or use
--extend-exclude.

Requirements files parsing

deptry now uses requirements-parser to parse dependencies from
requirements files, meaning that it can now extract nested requirements files referenced in other requirements files
without having to explicitly configure it in deptry.

For instance, if you have:

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