fix: examples/event-analytics/backend/package.json & examples/event-a…

…nalytics/backend/yarn.lock to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-AWSSDK-1059424
- https://snyk.io/vuln/SNYK-JS-AXIOS-1038255
- https://snyk.io/vuln/SNYK-JS-AXIOS-1579269
- https://snyk.io/vuln/SNYK-JS-AXIOS-174505
- https://snyk.io/vuln/SNYK-JS-FOLLOWREDIRECTS-2332181
- https://snyk.io/vuln/SNYK-JS-FOLLOWREDIRECTS-2396346
- https://snyk.io/vuln/SNYK-JS-LODASH-1018905
- https://snyk.io/vuln/SNYK-JS-LODASH-1040724
- https://snyk.io/vuln/SNYK-JS-LODASH-450202
- https://snyk.io/vuln/SNYK-JS-LODASH-567746
- https://snyk.io/vuln/SNYK-JS-LODASH-608086
- https://snyk.io/vuln/SNYK-JS-MOMENT-2440688
- https://snyk.io/vuln/SNYK-JS-MOMENT-2944238
- https://snyk.io/vuln/SNYK-JS-QS-3153490
- https://snyk.io/vuln/SNYK-JS-XML2JS-5414874
- https://snyk.io/vuln/npm:debug:20170905

examples/event-analytics/backend/package.json

@@ -8,6 +8,6 @@
   "dependencies": {
     "@cubejs-backend/athena-driver": "0.0.27",
     "@cubejs-backend/server": "0.0.28",
-    "@cubejs-backend/serverless": "0.0.28"
+    "@cubejs-backend/serverless": "0.31.15"
   }
 }