blitz: fix WebSocket UAF + re-enable echo-ws benchmark

- Update blitz dependency to 541cd3b (WebSocket send-inflight fix)
- Add echo-ws back to meta.json tests
- Root cause: ArrayList reallocation during io_uring send invalidated
  the send SQE's buffer pointer (use-after-free)
- Fix defers frame processing until send completes

Author: BennyFranciscus

frameworks/blitz/build.zig.zon

@@ -9,8 +9,8 @@
     },
     .dependencies = .{
         .blitz = .{
-            .url = "https://github.com/BennyFranciscus/blitz/archive/85563faa57d83d82523ece907793c56a037c4f1d.tar.gz",
-            .hash = "blitz-0.1.0-OJAP5pT0BAB0Cz0lSfeXA-h9xOG5UPoJPTeUcHxKIoA1",
+            .url = "https://github.com/BennyFranciscus/blitz/archive/541cd3bae622b76e76c3c8b68d5f50825e38d75c.tar.gz",
+            .hash = "blitz-0.1.0-OJAP5jf0BABVpa50QwnJV50pDkAVhriR21R3sR7OfagO",
         },
     },
 }

frameworks/blitz/meta.json

@@ -13,6 +13,7 @@
     "limited-conn",
     "json",
     "upload",
-    "compression"
+    "compression",
+    "echo-ws"
   ]
 }