[6.0] 765d564a9 [cci] PowerTools -> powertools

[Reza Naghibi]

commit 765d564a9d4d1bccdd760a86132b35c4c10e560f
Author: Guillaume Quintard <guillaume at varnish-software.com>
Date:   Wed Dec 9 15:35:22 2020 -0800

    [cci] PowerTools -> powertools

diff --git a/.circleci/config.yml b/.circleci/config.yml
index 0b8da355f..d830ae1df 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -169,7 +169,7 @@ jobs:
             if [ << parameters.dist >> = centos ]; then
                 if [ << parameters.release >> = 8 ]; then
                     dnf install -y 'dnf-command(config-manager)'
-                    yum config-manager --set-enabled PowerTools
+                    yum config-manager --set-enabled powertools
                     yum install -y diffutils python3-sphinx
                 else
                     yum install -y python-sphinx