Update Node.js dependencies and prepare patch release 0.38.7

[Copilot]

Standard dependency update for patch release, with core submodule pointing to PR microsoft/typespec#9530 (commit d41111a6) instead of main branch to pick up File support changes.

Dependencies Updated

• @azure-tools/typespec-autorest: 0.64.0 → 0.64.1
• @azure-tools/typespec-azure-resource-manager: 0.64.0 → 0.64.1
• @azure-tools/typespec-client-generator-core: 0.64.4 → 0.64.5
• @microsoft/api-extractor: 7.55.2 → 7.56.0
• @types/node: 25.0.10 → 25.1.0

Changes

• Core submodule: 8a5b768 → d41111a6 (PR #9530 HEAD)
• peerDependencies in typespec-extension synced with devDependencies
• overrides in typespec-tests synced with typespec-extension versions
• Version bump: 0.38.6 → 0.38.7
• SyncTests.ps1 regenerated test files for ARM resource interfaces

Post-merge Actions

1. Trigger NPM publish pipeline
2. Trigger SDK sync pipeline after NPM publish

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/repos/microsoft/typespec/pulls/9530
  • Triggering command: /usr/bin/curl curl -s REDACTED (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

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