feat(webkit): roll to r1864 (#23794)

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packages/playwright-core/browsers.json

@@ -33,7 +33,7 @@
     },
     {
       "name": "webkit",
-      "revision": "1863",
+      "revision": "1864",
       "installByDefault": true,
       "revisionOverrides": {
         "mac10.14": "1446",