CRAN release v2.1.1

[krlmlr]

Action items

• Groom NEWS.md and cran-comments.md
• Wait for successful tests
• If needed, tweak and review PR
• Run fledge::release()
• Confirm CRAN e-mail
• When the package is accepted on CRAN, run fledge::post_release() (often handled by GitHub Actions)

[aviator-app[bot]]

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