Bump jsignpdf/jsignpdf-php from 1.2.0 to 1.2.1

Bumps [jsignpdf/jsignpdf-php](https://github.com/JSignPdf/jsignpdf-php) from 1.2.0 to 1.2.1.
- [Release notes](https://github.com/JSignPdf/jsignpdf-php/releases)
- [Commits](JSignPdf/jsignpdf-php@v1.2.0...v1.2.1)

---
updated-dependencies:
- dependency-name: jsignpdf/jsignpdf-php
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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