Update upstream trials (#763)

Adds "WebAssembly JavaScript Promise Integration"

Author: amandabaker

origin-trials/upstream-trials.json

@@ -168,6 +168,12 @@
       "feedbackLink": "https://bugs.chromium.org/p/v8/issues/list",
       "explainer": "https://github.com/WebAssembly/gc/blob/master/proposals/gc/Overview.md"
     },
+    {
+      "label": "WebAssembly JavaScript Promise Integration",
+      "expiration": "2024-10-29",
+      "repo": "WebAssembly/js-promise-integration",
+      "explainer": "https://github.com/WebAssembly/js-promise-integration"
+    },
     {
       "label": "WebAssembly JS String Builtins",
       "expiration": "2024-06-25",