chore: update dependency mysql2 to ^3.15.3

Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package-lock.json

@@ -24,7 +24,7 @@
     "debug": "^4.4.3",
     "lodash": "^4.17.21",
     "loopback-connector": "^6.2.12",
-    "mysql2": "^3.15.2",
+    "mysql2": "^3.15.3",
     "strong-globalize": "^6.0.6"
   },
   "devDependencies": {