Bump ng2-pdf-viewer from 9.0.0 to 9.1.0 in /src-ui

Bumps [ng2-pdf-viewer](https://github.com/VadimDez/ng2-pdf-viewer) from 9.0.0 to 9.1.0.
- [Release notes](https://github.com/VadimDez/ng2-pdf-viewer/releases)
- [Changelog](https://github.com/VadimDez/ng2-pdf-viewer/blob/master/CHANGELOG.md)
- [Commits](https://github.com/VadimDez/ng2-pdf-viewer/compare/9.0.0...9.1.0)

---
updated-dependencies:
- dependency-name: ng2-pdf-viewer
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

src-ui/package.json

@@ -27,7 +27,7 @@
     "@popperjs/core": "^2.11.5",
     "bootstrap": "^5.2.0",
     "file-saver": "^2.0.5",
-    "ng2-pdf-viewer": "^9.0.0",
+    "ng2-pdf-viewer": "^9.1.0",
     "ngx-color": "^7.3.3",
     "ngx-cookie-service": "^14.0.1",
     "ngx-file-drop": "^14.0.1",