Update dependency simple-oauth2 to v5

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

Author: renovate[bot]

package.json

@@ -21,6 +21,6 @@
     "dotenv": "^2.0.0",
     "express": "^4.15.2",
     "randomstring": "^1.1.5",
-    "simple-oauth2": "^1.2.0"
+    "simple-oauth2": "^5.0.0"
   }
 }