Make startup time dynamic timestamp

[dkay0670]

Make startup time dynamic timestamp

[Copilot]

Pull Request Overview

This pull request updates the startup time display to use a dynamic Discord timestamp instead of a fixed string.

• Converts startup time to a dynamic timestamp format ("<t:...:R>").
• Updates the fallback value from "None" to "Unknown".

Comments suppressed due to low confidence (1)

techsupport_bot/commands/botinfo.py:52

• The fallback value has been changed from 'None' to 'Unknown'. Please verify that this difference is intentional, as it may lead to inconsistency in the displayed information compared to other fields.

value=(
                f"<t:{int(self.bot.startup_time.timestamp())}:R>"
                if self.bot.startup_time
                else "Unknown"
            ),