chore: publish new catalogue release changes

recipes.json

@@ -1529,6 +1529,20 @@
                         "tag": "13-alpine"
                     }
                 }
+            },
+            {
+                "1.1.0+v1.51.0": {
+                    "app": {
+                        "digest": "b67d866",
+                        "image": "matrixdotorg/synapse",
+                        "tag": "v1.51.0"
+                    },
+                    "db": {
+                        "digest": "1c1f81c",
+                        "image": "postgres",
+                        "tag": "13-alpine"
+                    }
+                }
             }
         ],
         "website": "https://github.com/matrix-org/synapse/"