www/agate: Update 3.3.18 => 3.3.19

[alven]

Summary

Changelogs:

• https://github.com/mbrubeck/agate/blob/master/CHANGELOG.md#3319---2025-09-18
• https://github.com/mbrubeck/agate/compare/v3.3.18...v3.3.19

Test Plan

For every {amd64, i386} × {14.3, 13.5}:

• Successful poudriere testport
• Successful run-testing

[yuri]

Approved.

Thanks,
Yuri

[alven]

Thank you for the review.

I also need your advice: how to better overcome name collision with net/stc?
Uppercase was an attempt to do exactly this, but you may have better variant?
Should I use PKGNAMEPREFIX? Or rename the port to something like 'stclib'?

[alven]

Sorry, posted to wrong browser tab with another review...