Bump backbone from 1.2.3 to 1.3.3

Bumps [backbone](https://github.com/jashkenas/backbone) from 1.2.3 to 1.3.3.
- [Release notes](https://github.com/jashkenas/backbone/releases)
- [Commits](https://github.com/jashkenas/backbone/compare/1.2.3...1.3.3)

Signed-off-by: dependabot[bot] <support@dependabot.com>
Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

package-lock.json

@@ -1226,11 +1226,11 @@
       }
     },
     "backbone": {
-      "version": "1.2.3",
-      "resolved": "https://registry.npmjs.org/backbone/-/backbone-1.2.3.tgz",
-      "integrity": "sha1-wiz9B/yG676uYdGJKe0RXpmdZbk=",
+      "version": "1.3.3",
+      "resolved": "https://registry.npmjs.org/backbone/-/backbone-1.3.3.tgz",
+      "integrity": "sha1-TMgOp8sWMaxHSInOQPL4vGg7KZk=",
       "requires": {
-        "underscore": ">=1.7.0"
+        "underscore": ">=1.8.3"
       }
     },
     "balanced-match": {

package.json

@@ -22,7 +22,7 @@
   "dependencies": {
     "Select2": "git+https://github.com/select2/select2.git#3.4.8",
     "autosize": "^4.0.2",
-    "backbone": "^1.2.3",
+    "backbone": "^1.3.3",
     "blueimp-md5": "^2.7.0",
     "bootstrap": "^3.4.0",
     "clipboard": "^1.7.1",