fix: improve cancel_all to never deadlock

backend/.sqlx/query-caeb49629b8673c1f1c84a6e40c3e2d2c3bc3fdbde530a0a6b6fd68a22b867c3.json

@@ -1,6 +1,6 @@
 {
   "db_name": "PostgreSQL",
-  "query": "UPDATE queue SET canceled = true,  canceled_by = $2, scheduled_for = now(), suspend = 0 WHERE scheduled_for < now() AND workspace_id = $1 AND schedule_path IS NULL RETURNING id, running, is_flow_step",
+  "query": "SELECT id, running, is_flow_step FROM queue WHERE scheduled_for < now() AND workspace_id = $1 AND schedule_path IS NULL",
   "describe": {
     "columns": [
       {
@@ -21,8 +21,7 @@
     ],
     "parameters": {
       "Left": [
-        "Text",
-        "Varchar"
+        "Text"
       ]
     },
     "nullable": [
@@ -31,5 +30,5 @@
       true
     ]
   },
-  "hash": "18699cb0eca25b6bde05d81571dfdea8cafd0043634f61b0f652a93767c9c30a"
+  "hash": "caeb49629b8673c1f1c84a6e40c3e2d2c3bc3fdbde530a0a6b6fd68a22b867c3"
 }

backend/.sqlx/query-d4fb94ee8198592c24e85d29078feb5220ab367e339510ee0e83bb7b5abfd184.json

@@ -0,0 +1,23 @@
+{
+  "db_name": "PostgreSQL",
+  "query": "UPDATE queue SET canceled = true,  canceled_by = $1, scheduled_for = now(), suspend = 0 WHERE id = $2 RETURNING 1 as one",
+  "describe": {
+    "columns": [
+      {
+        "ordinal": 0,
+        "name": "one",
+        "type_info": "Int4"
+      }
+    ],
+    "parameters": {
+      "Left": [
+        "Varchar",
+        "Uuid"
+      ]
+    },
+    "nullable": [
+      null
+    ]
+  },
+  "hash": "d4fb94ee8198592c24e85d29078feb5220ab367e339510ee0e83bb7b5abfd184"
+}