Fix spurious server build error on MacOS

Summary:
Copying files will randomly fail with something akin to

```
Error: Cannot copy '../acirb/bin/acorn' to a subdirectory of itself, '../acorn/bin/acorn'.
```

See https://github.com/jprichardson/node-fs-extra/issues/708

Reviewed By: antonk52

Differential Revision: D50263977

fbshipit-source-id: 39091ef57b79c692ec89e7a250595509839e2af8

desktop/scripts/build-flipper-server-release.tsx

@@ -733,7 +733,10 @@ async function bundleServerReleaseForPlatform(
   }
 
   console.log(`⚙️  Copying from ${dir} to ${outputPaths.resourcesPath}`);
-  await fs.copy(dir, outputPaths.resourcesPath);
+  await fs.copy(dir, outputPaths.resourcesPath, {
+    overwrite: true,
+    dereference: true,
+  });
 
   console.log(`⚙️  Downloading compatible node version`);
   await installNodeBinary(outputPaths.nodePath, platform);