build(deps): bump pages/.vitepress/theme from 9831821 to ea640b3

Bumps [pages/.vitepress/theme](https://github.com/GabsEdits/aplos-theme) from `9831821` to `ea640b3`.
- [Commits](aplosdev/submodule@9831821...ea640b3)

---
updated-dependencies:
- dependency-name: pages/.vitepress/theme
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>