lib: event static properties non writable and configurable

The idl definition for Event makes the properties constants
this means that they shouldn't be configurable and writable.
However, they were, and this commit fixes that.

Fixes: #50417

lib/internal/event_target.js

@@ -349,32 +349,37 @@ ObjectDefineProperties(
     isTrusted: isTrustedDescriptor,
   });
 
-Object.defineProperties(Event, {
-  NONE: {
-    writable: false,
-    configurable: false,
-    enumerable: true,
-    value: 0,
-  },
-  CAPTURING_PHASE: {
-    writable: false,
-    configurable: false,
-    enumerable: true,
-    value: 1,
-  },
-  AT_TARGET: {
-    writable: false,
-    configurable: false,
-    enumerable: true,
-    value: 2,
-  },
-  BUBBLING_PHASE: {
-    writable: false,
-    configurable: false,
-    enumerable: true,
-    value: 3,
-  }
-});
+ObjectDefineProperties(
+  Event, {
+    NONE: {
+      __proto__: null,
+      writable: false,
+      configurable: false,
+      enumerable: true,
+      value: 0,
+    },
+    CAPTURING_PHASE: {
+      __proto__: null,
+      writable: false,
+      configurable: false,
+      enumerable: true,
+      value: 1,
+    },
+    AT_TARGET: {
+      __proto__: null,
+      writable: false,
+      configurable: false,
+      enumerable: true,
+      value: 2,
+    },
+    BUBBLING_PHASE: {
+      __proto__: null,
+      writable: false,
+      configurable: false,
+      enumerable: true,
+      value: 3,
+    },
+  });
 
 function isCustomEvent(value) {
   return isEvent(value) && (value?.[kDetail] !== undefined);

test/parallel/test-event-target.js

@@ -0,0 +1,13 @@
+'use strict';
+
+require('../common');
+const assert = require('assert');
+
+const props = ['NONE', 'CAPTURING_PHASE', 'AT_TARGET', 'BUBBLING_PHASE'];
+
+for (const prop of props) {
+  const desc = Object.getOwnPropertyDescriptor(Event, prop);
+  assert.strictEqual(desc.writable, false);
+  assert.strictEqual(desc.configurable, false);
+  assert.strictEqual(desc.enumerable, true);
+}