Update dependency applicationinsights to v3.15.1

Author: renovate[bot]

package.json

@@ -38,7 +38,7 @@
     "@hmcts/nodejs-healthcheck": "^1.8.0",
     "@hmcts/nodejs-logging": "^4.0.4",
     "@hmcts/properties-volume": "^1.0.0",
-    "applicationinsights": "3.15.0",
+    "applicationinsights": "3.15.1",
     "body-parser": "^2.2.1",
     "config": "^1.26.1",
     "connect-timeout": "^1.9.0",