Bump shared from 81105a6 to 2ac18c0

Bumps [shared](https://github.com/ferrocene/sphinx-shared-resources) from `81105a6` to `2ac18c0`.
- [Commits](ferrocene/sphinx-shared-resources@81105a6...2ac18c0)

---
updated-dependencies:
- dependency-name: shared
  dependency-type: direct:production
...

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