chore(deps): update pnpm to v8.15.9 (#3078)

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

Author: renovate[bot]

package.json

@@ -4,10 +4,10 @@
   "license": "Apache-2.0",
   "repository": "https://github.com/interledger/rafiki",
   "engines": {
-    "pnpm": "^8.15.4",
+    "pnpm": "^8.15.9",
     "node": "20"
   },
-  "packageManager": "[email protected].5",
+  "packageManager": "[email protected].9",
   "scripts": {
     "preinstall": "npx only-allow pnpm",
     "lint": "eslint --max-warnings=0 --fix .",