Downgrade selenium version, as latest version don't support urllib3 v2.5.*

Author: akshay-joshi

web/regression/requirements.txt

@@ -27,7 +27,8 @@ linecache2==1.0.0
 pbr==6.1.1
 pycodestyle>=2.5.0
 python-mimeparse==2.0.0
-selenium==4.33.0
+# Do not upgrade selenium until latest version supports urllib3 2.5.*
+selenium==4.32.0
 testscenarios==0.5.0
 testtools==2.7.2
 traceback2==1.4.0