Merge pull request #2683 from searx/dependabot/pip/master/lxml-4.6.3

Bump lxml from 4.6.2 to 4.6.3

requirements.txt

@@ -4,7 +4,7 @@ flask-babel==2.0.0
 flask==1.1.2
 idna==2.10
 jinja2==2.11.3
-lxml==4.6.2
+lxml==4.6.3
 pygments==2.8.0
 python-dateutil==2.8.1
 pyyaml==5.4.1