Fix failing EngineIO CI configuration

[sleeyax]

I was just missing the build command. I assumed cargo run would already build + run the binary, not sure why it doesn't seem to work that way though. Anyways, this commit should fix it.

[sleeyax]

Note that 1 test still fails because the non-base64-encoded binary packet still isn't' implemented, as I mentioned in #24 (comment):

1) Engine.IO protocol
       message
         HTTP long-polling
           sends and receives a payload containing plain text and binary packets (binary):

      AssertionError: expected  to deeply equal 
      + expected - actual


      at Context.<anonymous> (file:///home/runner/work/socketioxide/socketioxide/engine.io-protocol/test-suite/test-suite.js:279:27)
      at processTicksAndRejections (node:internal/process/task_queues:96:5)