oh-my-posh: update to version 28.0.0

[PinoTucana]

Description

Type(s)

• bugfix
• enhancement
• security fix

Tested on

macOS 15.7.2 24G325 arm64
Xcode 16.4 16F6

Verification

Have you

• followed our Commit Message Guidelines?
• squashed and minimized your commits?
• checked that there aren't other open pull requests for the same change?
• referenced existing tickets on Trac with full URL in commit message?
• checked your Portfile with port lint?
• tried existing tests with sudo port test?
• tried a full install with sudo port -vst install?
• tested basic functionality of all binary files?
• checked that the Portfile's most important variants haven't been broken?

[macportsbot]

Notifying maintainers:
@herbygillot for port oh-my-posh.