workflows/release-binaries-all: Add missing secret input (llvm#126921)

Since d194c6b this workflow was missing
the secret input which was causing it to fail.

Author: tstellar

.github/workflows/release-binaries-all.yml

@@ -27,6 +27,10 @@ on:
         required: true
         default: false
         type: boolean
+    secrets:
+      RELEASE_TASKS_USER_TOKEN:
+        description: "Secret used to check user permissions."
+        required: false
 
   pull_request:
     types: