www/rustypaste-cli: Update to 0.8.0

ChangeLog: https://github.com/orhun/rustypaste-cli/blob/v0.8.0/CHANGELOG.md

• Added:
  • Add option to delete file(s) from server.
• Changed:
  • Use IsTerminal from stdlib.
  • Disable Rust beta builds.
  • Upgrade dependencies.

PR: 274120