sysutils/tuptime: Update to 5.2.1

Changelog:

• Return -e option as an argument for --dec decimals
• Add rc script for OpenBSD and update installation doc
• Deprecate --pctl option
• Adding -E, --exclude option
• Print longest uptime and downtime values on default output
• Code refactoring

PR: 266579
Reviewed by: Jeremy Johnston <jeremy@smart-serv.net> (maintainer)