deps: bump @github/copilot to 1.0.69-2 (ships FFI host exports)

The published 1.0.69-2 runtime.node exports copilot_runtime_host_start
and copilot_runtime_host_shutdown, so the in-process FFI E2E test now
passes against the auto-bundled cdylib without needing COPILOT_CLI_PATH.

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

Author: SteveSandersonMS

nodejs/package-lock.json

@@ -56,7 +56,7 @@
     "author": "GitHub",
     "license": "MIT",
     "dependencies": {
-        "@github/copilot": "^1.0.69-1",
+        "@github/copilot": "^1.0.69-2",
         "vscode-jsonrpc": "^8.2.1",
         "zod": "^4.3.6"
     },