feat(webkit): roll to r1381 (microsoft#4388)

aslushnikov · web-flow · commit c2db83733b58 · 2020-11-09T20:27:37.000-08:00
This should resurrect our WebKit BigSur bots.
diff --git a/browsers.json b/browsers.json
@@ -13,7 +13,7 @@
     },
     {
       "name": "webkit",
-      "revision": "1380",
+      "revision": "1381",
       "download": true
     }
   ]
