Fixes issue #75

[danielvartan]

Hi there 👋,

This Pull Request fixes a clipr issue that occurs on Wayland systems. You can find more details in issue #75.

Thank you!

[danielvartan]

Please note that the checks failed due to issues with the package’s GitHub Actions and are unrelated to the changes in this PR.

Error: This request has been automatically failed because it uses a deprecated version of `actions/cache: v2`. Please update your workflow to use v3/v4 of actions/cache to avoid interruptions. Learn more: https://github.blog/changelog/2024-12-05-notice-of-upcoming-releases-and-breaking-changes-for-github-actions/#actions-cache-v1-v2-and-actions-toolkit-cache-package-closing-down

[Copilot]

Pull request overview

This PR addresses a Wayland-specific hang by changing how clipr probes for clipboard utilities on Linux, specifically avoiding a blocking wl-copy invocation during availability checks.

Changes:

• Adjusts has_util() to call system2(..., stderr = FALSE) while probing utilities.
• Updates the wl-copy probe to pass a text argument ("clipboard") so the command doesn’t block waiting for stdin.

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[mdlincoln]

Thank you so much for finding the issue, fixing it, and extreme patience while I negletected this project!