Revert "[fix] update user agent"

This reverts commit 3c6549a17f886b90a8e700810f9e1aea86581966.

Related:

- https://github.com/searxng/searxng/pull/2826

searx/data/useragents.json

@@ -7,5 +7,5 @@
         "Windows NT 10.0; Win64; x64",
         "X11; Linux x86_64"
     ],
-    "ua": "Mozilla/5.0 ({os}; rv:109.0) Gecko/20100101 Firefox/{version}"
-}
+    "ua": "Mozilla/5.0 ({os}; rv:{version}) Gecko/20100101 Firefox/{version}"
+}

searxng_extra/update/update_firefox_version.py

@@ -32,7 +32,7 @@ useragents = {
     "versions": (),
     "os": ('Windows NT 10.0; Win64; x64',
            'X11; Linux x86_64'),
-    "ua": "Mozilla/5.0 ({os}; rv:109.0) Gecko/20100101 Firefox/{version}",
+    "ua": "Mozilla/5.0 ({os}; rv:{version}) Gecko/20100101 Firefox/{version}",
     # fmt: on
 }
 
@@ -64,12 +64,6 @@ def fetch_firefox_last_versions():
     major_last = versions[0].major
     major_list = (major_last, major_last - 1)
     for version in versions:
-        msg = (
-            "Please check if the rv segment of the user agent is still frozen at 109.0: "
-            "https://bugzilla.mozilla.org/show_bug.cgi?id=1805967"
-        )
-        assert version.major != 120, msg
-
         major_current = version.major
         minor_current = version.minor
         if major_current in major_list: