Merge pull request #1511 from searxng/dependabot/pip/master/flask-2.1.3

Bump flask from 2.1.2 to 2.1.3

requirements.txt

@@ -1,7 +1,7 @@
 certifi==2022.6.15
 babel==2.10.3
 flask-babel==2.0.0
-flask==2.1.2
+flask==2.1.3
 jinja2==3.1.2
 lxml==4.9.1
 pygments==2.12.0