Bump setasign/fpdi from 2.6.0 to 2.6.1

Bumps [setasign/fpdi](https://github.com/Setasign/FPDI) from 2.6.0 to 2.6.1.
- [Release notes](https://github.com/Setasign/FPDI/releases)
- [Commits](Setasign/FPDI@v2.6.0...v2.6.1)

---
updated-dependencies:
- dependency-name: setasign/fpdi
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>