Merge pull request #1740 from searxng/dependabot/pip/master/black-22.8.0

Bump black from 22.6.0 to 22.8.0

requirements-dev.txt

@@ -1,7 +1,7 @@
 mock==4.0.3
 nose2[coverage_plugin]==0.12.0
 cov-core==1.15.0
-black==22.6.0
+black==22.8.0
 pylint==2.15.0
 splinter==0.18.1
 selenium==4.4.3