Upgrade psych to version 3.0.2

[depfu]

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We've upgraded a dependency and here is what you need to know:

name	version specification	new version
psych	~> 2.0	3.0.2

Please take a good look at the info here and the test results before merging this pull request.

What changed?

✳️ psych ( → 3.0.2) · Repo · Changelog

Commits

See the full diff on Github. The new version differs by 3 commits:

• Bump version to 3.0.2
• Merge pull request #342 from stomar/fallback-keyword
• Merge pull request #338 from stomar/doc_safe_load

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Depfu will automatically keep this PR conflict-free, as long as you don't add any commits to this branch yourself. You can also trigger a rebase manually by commenting with @depfu rebase.

[depfu]

Closed in favor of #5.

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