Bump blueimp-file-upload from 9.12.5 to 9.34.0

This is the last version in the 9.x series and was released in February
2019.

We'll first try out this version before upgrading to version 10.32.0
(the latest version) because it's been a long time since we upgraded
this gem and so we're doing the upgrade in two steps.

package.json

@@ -1,7 +1,7 @@
 {
   "name": "consuldemocracy",
   "dependencies": {
-    "blueimp-file-upload": "9.12.5",
+    "blueimp-file-upload": "^9.34.0",
     "foundation-sites": "^6.6.2",
     "jquery": "^3.7.1",
     "jquery-ui": "^1.13.2",