Update embedpdf-snippet to version 2.9.1

- Updated the embedpdf-snippet dependency in package.json from version 2.3.0 to 2.9.1.
- Updated the upstream version file to reflect the new version.
- Removed the old embedpdf-snippet-2.3.0.tgz file.
- Added the new embedpdf-snippet-2.9.1.tgz file.

package.json

@@ -87,7 +87,7 @@
     "bwip-js": "^4.8.0",
     "cropperjs": "^1.6.2",
     "diff": "^8.0.3",
-    "embedpdf-snippet": "file:vendor/embedpdf/embedpdf-snippet-2.3.0.tgz",
+    "embedpdf-snippet": "file:vendor/embedpdf/embedpdf-snippet-2.9.1.tgz",
     "heic2any": "^0.0.4",
     "highlight.js": "^11.11.1",
     "html2canvas": "^1.4.1",