fix: package.json to reduce vulnerabilities (#1049)

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/npm:minimatch:20160620

Latest report for vufind-org/vufind:
https://snyk.io/test/github/vufind-org/vufind

package.json

@@ -10,7 +10,7 @@
     "url": "https://vufind.org/jira"
   },
   "dependencies": {
-    "grunt": "^0.4.5",
+    "grunt": "^1.0.0",
     "grunt-sass": "^1.0.0",
     "grunt-contrib-less": "1.3.0",
     "grunt-less-to-sass": "0.0.10",