Bump setasign/fpdi from 2.6.3 to 2.6.4

Bumps [setasign/fpdi](https://github.com/Setasign/FPDI) from 2.6.3 to 2.6.4.
- [Release notes](https://github.com/Setasign/FPDI/releases)
- [Commits](Setasign/FPDI@v2.6.3...v2.6.4)

---
updated-dependencies:
- dependency-name: setasign/fpdi
  dependency-version: 2.6.4
  dependency-type: indirect
...

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

Author: dependabot[bot]