test: test "current" agoric-sdk against some fork of endo

Author: erights

packages/SwingSet/test/upgrade/test-upgrade.js

@@ -133,6 +133,8 @@ const initKernelForTest = async (t, bundleData, config, options = {}) => {
   };
 };
 
+// Gratuitous change so I can create an otherwise identical PR
+
 const testNullUpgrade = async (t, defaultManagerType) => {
   const config = makeConfigFromPaths('../../tools/bootstrap-relay.js', {
     defaultManagerType,