Bump vendor/github.com/cantabular/poppler from 78ea29d to 2751fab

Bumps [vendor/github.com/cantabular/poppler](https://github.com/cantabular/poppler) from `78ea29d` to `2751fab`.
- [Commits](cantabular/poppler@78ea29d...2751fab)

---
updated-dependencies:
- dependency-name: vendor/github.com/cantabular/poppler
  dependency-version: 2751fab4ca54ff1823c5655bfd128f41d860ae39
  dependency-type: direct:production
...

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Author: dependabot[bot]