fix: frontend/.snyk & frontend/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with a Snyk patch:
- https://snyk.io/vuln/SNYK-JS-LODASH-567746

frontend/.snyk

@@ -1,5 +1,10 @@
 # Snyk (https://snyk.io) policy file, patches or ignores known vulnerabilities.
-version: v1.13.5
-# ignores vulnerabilities until expiry date; change duration by modifying expiry date
-ignore:
-patch: {}
+version: v1.14.1
+ignore: {}
+# patches apply the minimum changes required to fix a vulnerability
+patch:
+  SNYK-JS-LODASH-567746:
+    - html-webpack-plugin > lodash:
+        patched: '2020-05-01T08:37:15.509Z'
+    - webpack-merge > lodash:
+        patched: '2020-05-01T08:37:15.509Z'