Update devcontainer VARIANT to 1-trixie

[mricherzhagen]

PR Description

The previous 1-bullseye did not have the required go version 1.25.0

Please check if the PR fulfills these requirements

• Cheatsheets are up-to-date (run go generate ./...)
• Code has been formatted (see here)
• Tests have been added/updated (see here for the integration test guide)
• Text is internationalised (see here)
• If a new UserConfig entry was added, make sure it can be hot-reloaded (see here)
• Docs have been updated if necessary
• You've read through your own file changes for silly mistakes etc

[stefanhaller]

This has come up before (see here).

As I know nothing about devcontainers I can't tell if this is a reasonable change, but I'm willing to trust you on that. Just wondering if we should also change something about the comment above that line? I have no idea what all that means. 😅