Update dependency webrick to v1.9.2

Author: renovate[bot]

Gemfile.lock

@@ -668,7 +668,7 @@ GEM
     useragent (0.16.11)
     warden (1.2.9)
       rack (>= 2.0.9)
-    webrick (1.9.1)
+    webrick (1.9.2)
     websocket-driver (0.8.0)
       base64
       websocket-extensions (>= 0.1.0)