fix: upgrade aws-xray-sdk-mysql from 2.4.0 to 2.5.0

Snyk has created this PR to upgrade aws-xray-sdk-mysql from 2.4.0 to 2.5.0.

See this package in npm:
https://www.npmjs.com/package/aws-xray-sdk-mysql

See this project in Snyk:
https://app.snyk.io/org/jpascoe/project/22915ed3-5214-4587-ac3a-87ba21696db4?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot

sample-apps/rds-mysql/lib/nodejs/package.json

@@ -4,7 +4,7 @@
   "private": true,
   "dependencies": {
     "aws-xray-sdk-core": "2.4.0",
-    "aws-xray-sdk-mysql": "2.4.0",
+    "aws-xray-sdk-mysql": "2.5.0",
     "md5": "2.2.1",
     "mysql2": "2.1.0"
   },