chore(deps): update dependency redis to ^4.6.15

Author: renovate[bot]

apps/backend/package.json

@@ -48,7 +48,7 @@
     "passport": "^0.6.0",
     "passport-jwt": "^4.0.1",
     "passport-oauth2": "^1.7.0",
-    "redis": "^4.6.11",
+    "redis": "^4.6.15",
     "reflect-metadata": "^0.2.1",
     "rxjs": "^7.8.1",
     "typeorm": "^0.3.20"