build+docs: support CentOS Stream 9, drop CentOS 8

Refs: #5181
Change-Id: I2d8bc595bad047ceaa78bd3729848491b843e83d
diff --git a/.jenkins.d/00-deps.sh b/.jenkins.d/00-deps.sh
index 9593baa..5c672b0 100755
--- a/.jenkins.d/00-deps.sh
+++ b/.jenkins.d/00-deps.sh
@@ -44,8 +44,7 @@
             ;;
     esac
 
-elif has CentOS-8 $NODE_LABELS; then
-    sudo dnf config-manager --enable powertools
+elif has CentOS $NODE_LABELS; then
     sudo dnf -y install gcc-c++ libasan pkgconf-pkg-config python3 \
                         boost-devel openssl-devel sqlite-devel \
                         libpcap-devel systemd-devel