Merge pull request #2415 from return42/upd-useragent

update useragents

searx/data/useragents.json

@@ -1,12 +1,12 @@
 {
     "versions": [
-        "75.0",
-        "74.0.1",
-        "74.0"
+        "84.0.1",
+        "84.0",
+        "83.0"
     ],
     "os": [
         "Windows NT 10.0; WOW64",
         "X11; Linux x86_64"
     ],
     "ua": "Mozilla/5.0 ({os}; rv:{version}) Gecko/20100101 Firefox/{version}"
-}
+}