[ruby/rack] Correct passenger data (TechEmpower#9892)

Passenger runs with mri and the `rack` tests are all Platform.

Author: p8

frameworks/Ruby/rack/benchmark_config.json

@@ -116,12 +116,12 @@
         "update_url": "/updates?queries=",
         "port": 8080,
         "approach": "Realistic",
-        "classification": "Micro",
+        "classification": "Platform",
         "orm": "raw",
         "database": "Postgres",
         "framework": "rack",
         "language": "Ruby",
-        "platform": "Jruby",
+        "platform": "Mri",
         "webserver": "Passenger",
         "os": "Linux",
         "database_os": "Linux",