security/1password-client2: upgrade to 2.28.0

ChangeLog:
This release updates the name of the Private vault for 1Password Business accounts to "Employee vault", and also improves SSH key support and the macOS package installer.

NEW
Private vaults have been renamed Employee vaults for 1Password Business accounts. {3810}
IMPROVEMENTS
1Password can now retrieve PKCS1-formatted SSH keys using op read. {3993}
FIXED
The 1Password CLI package installer for macOS now correctly displays the CLI version in the package receipt. {4027}