games/anki: Update to 26.08
- Switch to USES=npm and adjust/remove the relevant parts.
Although Yarn v4 is already being used according to "package.json", stick with Yarn v1 for now to complete a 1:1 migration from the before to the after state with respect to the used tools during build.
Changelog:
https://github.com/ankitects/anki/releases/tag/26.08
(cherry picked from commit 9b3e128970f2c53a39eed9b0157514459a5b131f)