fix: handle breaking changes in Sinon 17.0.2

Sinon 17.0.2 shipped with a breaking change for sinon-test (should have been
Sinon 18, really). By moving the removed file into this repo, all is good.

lib/default-config.js

@@ -0,0 +1,22 @@
+"use strict";
+
+module.exports = {
+    injectInto: null,
+    injectIntoThis: true,
+    properties: [
+        "spy",
+        "stub",
+        "mock",
+        "clock",
+        "server",
+        "requests",
+        "fake",
+        "define",
+        "replace",
+        "replaceSetter",
+        "replaceGetter",
+        "createStubInstance",
+    ],
+    useFakeTimers: true,
+    useFakeServer: true,
+};

lib/test.js

@@ -3,9 +3,10 @@
  */
 "use strict";
 
-var utils = require("./utils");
-var getConfig = require("./get-config");
-var slice = Array.prototype.slice;
+const utils = require("./utils");
+const getConfig = require("./get-config");
+const defaultConfig = require("./default-config");
+const slice = Array.prototype.slice;
 
 function finish(sandbox, error, dontThrow) {
     if (error) {
@@ -74,10 +75,6 @@ function configure(sinon, config) {
 
     var sandboxFactory = sinon.createSandbox || sinon.sandbox.create;
 
-    var defaultConfig = Object.assign(
-        { injectIntoThis: true },
-        sinon.defaultConfig
-    );
     function callSandboxedFn(context, args, fn, handler) {
         var internalConfig = getConfig(defaultConfig, config);
         internalConfig.injectInto =