Last release was almost 4 years ago and the repository with outstanding issues and pull requests seems to be abandoned by the maintainer.
In addition the sole maintainer account may be abandoned that may represent account takeover risk.
Current outstanding issues include vulnerable dependencies that all together may mean that security issues may not be addressed now or in the future.
The below list has not been vetted in any way and may or may not contain alternatives;
arboard
clipboard-win
(Windows only)copy-pasta
x11-clipboard
(Linux/BSD only){ "license": "CC0-1.0" }