[listing-request] Add RecessHacks 3.0

[GrantProductions]

Please paste the following information into the following text to list your hackathon:

    {
      "title": "RecessHacks 3.0",
      "url": "https://recesshacks.com/",
      "startDate": "August 12",
      "endDate": "August 14",
      "year": "2023",
      "city": "Toronto, ON, Canada",
      "host": "none",
      "length": "48",
      "size": "150",
      "travel": "no",
      "prize": "yes",
      "highSchoolers": "yes",
      "cost": "free",
      "notes": "Up to $40000 in prizes for Canadian high schoolers"
    }

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