[docker] change static-expires to one year

dockerfiles/uwsgi.ini

@@ -44,9 +44,9 @@ logto = /var/log/uwsgi/uwsgi.log
 add-header = Connection: close
 
 # uwsgi serves the static files
-# expires set to one day as Flask does
+# expires set to one year since there are hashes
 static-map = /static=/usr/local/searxng/searx/static
-static-expires = /* 864000
+static-expires = /* 31557600
 static-gzip-all = True
 offload-threads = %k