taks.json schema is outdated and doesn't reflect Node20_1

[PavelBansky]

When updating our task to use Node20_1 in task.json

  "execution": {
    "Node20_1": {
      "target": "src/index.js",
      "argumentFormat": ""
    }

the Node20_1 is not part of the schema and it is causing a warning about the json file.
The schema should be updated to reflect Node20_1

https://raw.githubusercontent.com/Microsoft/azure-pipelines-task-lib/master/tasks.schema.json

[DmitriiBobreshev]

Hi @PavelBansky, thank you for the feedback. I've updated the scheme and now Node20_1 handler is in it.
Closing the issue, please feel free to reopen it if you have an additional problems with it