Update supported browsers

Update the baseline to match hypothesis/client#6438.

package.json

@@ -91,6 +91,6 @@
       "@trivago/prettier-plugin-sort-imports"
     ]
   },
-  "browserslist": "chrome 70, firefox 70, safari 11.1",
+  "browserslist": "chrome 92, firefox 90, safari 14.1",
   "packageManager": "yarn@3.6.1"
 }