[7.4] b34287567 circleci: Switch centos image to stream9 tag

[Dridi Boukelmoune]

commit b34287567c56041a6fabc7d9f7e5a885a84b2959
Author: Dridi Boukelmoune <dridi.boukelmoune at gmail.com>
Date:   Mon Jun 3 11:03:03 2024 +0200

    circleci: Switch centos image to stream9 tag
    
    The plain "stream" image has not been updated for a year, and instead of
    being the equivalent of a "latest" tag it just appears to be frozen.
    
    Since there isn't an automatic centos-stream upgrade path, let's target
    version 9 explicitly for now.

diff --git a/.circleci/config.yml b/.circleci/config.yml
index 94e434e55..e718074fd 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -391,7 +391,7 @@ workflows:
           name: build_centos_stream
           prefix: quay.io/centos/
           dist: centos
-          release: stream
+          release: stream9
       - build:
           name: build_almalinux_8
           dist: almalinux