update caddy plugins hash

lily/config.nix

···
         "github.com/mholt/caddy-events-exec@v0.1.0"
         "github.com/mholt/caddy-l4@v0.0.0-20250825142355-52451c524d96"
       ];
-      hash = "sha256-K/HtgdbdfeV/aHCRIXDvgfb2AL06YHh6+rLL15wUtmA=";
+      hash = "sha256-iy81BSX156Mf+ReQYpM/p/zEuQvizDfq3TnghZVy4v4=";
     };
     info.host.server = true;
   };