chore: Update server.json schema to 2025-12-11

- Update schema URL to latest version (2025-12-11)
- Remove 'status' field (now managed by registry per 2025-09-29 changelog)

Author: SamMorrowDrums

server.json

@@ -1,9 +1,8 @@
 {
-  "$schema": "https://static.modelcontextprotocol.io/schemas/2025-10-17/server.schema.json",
+  "$schema": "https://static.modelcontextprotocol.io/schemas/2025-12-11/server.schema.json",
   "name": "io.github.github/github-mcp-server",
   "description": "Connect AI assistants to GitHub - manage repos, issues, PRs, and workflows through natural language.",
   "title": "GitHub",
-  "status": "active",
   "repository": {
     "url": "https://github.com/github/github-mcp-server",
     "source": "github"