Update to linq-alpha

{
  "official": [
    {
      "name": "linq-alpha",
      "author": {
        "name": "LinqAlpha"
      },
      "source": {
        "ref": "main",
        "sha": "42202fdd4bd1cbb373c1f11a4114f173edffc437",
        "url": "https://github.com/linq-lab/linq-alpha-plugin.git",
        "path": "plugins/linq-alpha",
        "source": "git-subdir"
      },
      "category": "productivity",
      "homepage": "https://www.linqalpha.com",
      "description": "LinqAlpha financial research in Claude: guided setup for the LinqAlpha connector, capability-based source selection for fundamentals, estimates, transcripts, filings and market data, and an optional, opt-in default-source preference you can remove at any time. Requires a LinqAlpha account."
    }
  ]
}