build(deps): bump posthog-node in /apps/OpenSignServer

Bumps [posthog-node](https://github.com/PostHog/posthog-js-lite/tree/HEAD/posthog-node) from 4.5.0 to 4.8.1.
- [Release notes](https://github.com/PostHog/posthog-js-lite/releases)
- [Changelog](https://github.com/PostHog/posthog-js-lite/blob/main/posthog-node/CHANGELOG.md)
- [Commits](https://github.com/PostHog/posthog-js-lite/commits/posthog-node-v4.8.1/posthog-node)

---
updated-dependencies:
- dependency-name: posthog-node
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

apps/OpenSignServer/package-lock.json

@@ -37,7 +37,7 @@
         "parse-server": "^7.4.0",
         "parse-server-api-mail-adapter": "^4.1.0",
         "pdf-lib": "^1.17.1",
-        "posthog-node": "^4.5.0",
+        "posthog-node": "^4.8.1",
         "ws": "^8.18.0"
       },
       "devDependencies": {
@@ -16905,9 +16905,9 @@
       }
     },
     "node_modules/posthog-node": {
-      "version": "4.5.0",
-      "resolved": "https://registry.npmjs.org/posthog-node/-/posthog-node-4.5.0.tgz",
-      "integrity": "sha512-h1WTHYvgOZ7kBGH0XfKVOVsSyFgCEbgzC2RIw7fetsW6RrSvxPYcaycKUDfqa5EGbvU0SYLbqAeeqNZjPDaznA==",
+      "version": "4.8.1",
+      "resolved": "https://registry.npmjs.org/posthog-node/-/posthog-node-4.8.1.tgz",
+      "integrity": "sha512-ApMEC1+DbctP/88+VhaCl8SRKpIoReibMf7Mb3rxw3yMthr1rKaM4opbHdZJ0buLhwS5zX8B2ckqLjpwpSjRPg==",
       "license": "MIT",
       "dependencies": {
         "axios": "^1.7.4"

apps/OpenSignServer/package.json

@@ -46,7 +46,7 @@
     "parse-server": "^7.4.0",
     "parse-server-api-mail-adapter": "^4.1.0",
     "pdf-lib": "^1.17.1",
-    "posthog-node": "^4.5.0",
+    "posthog-node": "^4.8.1",
     "ws": "^8.18.0"
   },
   "type": "module",