build: support CentOS Stream 9, drop CentOS 8

Refs: #5181
Change-Id: I289930c9658137e1637357f81c762ebb331474c8
diff --git a/INSTALL.md b/INSTALL.md
index fdd94e5..369fd9c 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -16,13 +16,12 @@
 
   Comes with the base system on macOS.
 
-  On Ubuntu:
+  On Debian and Ubuntu:
 
       sudo apt install libpcap-dev
 
   On CentOS and Fedora:
 
-      sudo dnf config-manager --enable powertools  # CentOS only
       sudo dnf install libpcap-devel
 
 ## Build Steps