Update @github/copilot to 1.0.55-4 (#1453)

* Update @github/copilot to 1.0.55-4

- Updated nodejs and test harness dependencies
- Re-ran code generators
- Formatted generated code

* Fix Rust schema update tests

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Stephen Toub <stoub@microsoft.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: 3 people

dotnet/src/Generated/Rpc.cs

@@ -56,7 +56,7 @@
     "author": "GitHub",
     "license": "MIT",
     "dependencies": {
-        "@github/copilot": "^1.0.55-1",
+        "@github/copilot": "^1.0.55-4",
         "vscode-jsonrpc": "^8.2.1",
         "zod": "^4.3.6"
     },