Bump setasign/fpdf from 1.8.3 to 1.8.4
Bump setasign/fpdf from 1.8.3 to 1.8.4

Bumps [setasign/fpdf](https://github.com/Setasign/FPDF) from 1.8.3 to 1.8.4.
- [Release notes](https://github.com/Setasign/FPDF/releases)
- [Changelog](https://github.com/Setasign/FPDF/blob/master/changelog.htm)
- [Commits](https://github.com/Setasign/FPDF/compare/1.8.3...1.8.4)

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

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
ChristophWurst/weinstein_server,ChristophWurst/weinstein_server,ChristophWurst/weinstein_server