update capabilities unit test

ethereum/executionlayer/src/test/java/tech/pegasys/teku/ethereum/executionlayer/MilestoneBasedEngineJsonRpcMethodsResolverTest.java

@@ -223,6 +223,7 @@ void getsCapabilities() {
             "engine_getPayloadV3",
             "engine_forkchoiceUpdatedV3",
             "engine_newPayloadV4",
-            "engine_getPayloadV4");
+            "engine_getPayloadV4",
+            "engine_getBlobsV1");
   }
 }