Fix source break in swift-subprocess

```
error: type 'ErrorOutputProtocol' has no member 'standardError'
271 |     environment: environment,
272 |     output: .standardOutput,
273 |     error: .standardError,
    |             `- error: type 'ErrorOutputProtocol' has no member 'standardError'
274 |   )
275 |   guard result.terminationStatus.isSuccess else {
```

Author: ktoso

Sources/SwiftJavaTool/Commands/JavaCallbacksBuildCommand.swift

@@ -269,8 +269,8 @@ private func runSubprocess(
     .path(FilePath(executable)),
     arguments: .init(arguments),
     environment: environment,
-    output: .standardOutput,
-    error: .standardError,
+    output: FileDescriptorOutput.standardOutput,
+    error: FileDescriptorOutput.standardError,
   )
   guard result.terminationStatus.isSuccess else {
     throw JavaCallbacksBuildError(