Sync with canonical DAP schema source (debug-adapter-protocol, not vscode-debugadapter-node)

Currently, `go-dap`'s generator fetches the DAP JSON schema from [vscode-debugadapter-node](https://github.com/microsoft/vscode-debugadapter-node/blob/main/debugProtocol.json), but that's not the canonical source. Microsoft's [release docs](https://github.com/microsoft/debug-adapter-protocol/blob/main/contributing.md#releasing-dap-changes) from `microsoft/debug-adapter-protocol` confirm the canonical source is `debug-adapter-protocol/debugAdapterProtocol.json`.

As a result, DAP v1.71.0's `outputPresentation` field on `StartDebuggingRequestArguments` is present in the canonical Microsoft upstream but missing from go-dap's local schema.