Bump websocket-driver from 0.8.0 to 0.8.1 in /demo (#4138)

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Author: dependabot[bot]

demo/Gemfile.lock

@@ -369,7 +369,7 @@ GEM
       mutex_m
       rack-proxy (~> 0.6, >= 0.6.1)
       zeitwerk (~> 2.2)
-    websocket-driver (0.8.0)
+    websocket-driver (0.8.1)
       base64
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.5)