[gimp-web/oscp] Apply the same fix to main website's Dockerfile as previous commit.

[Jehan <jehanp src gnome org>]

commit 12a7e804c42dd58511d55082edc8976efa9e1c69
Author: Jehan <jehan girinstud io>
Date:   Wed Feb 23 14:37:58 2022 +0100

    Apply the same fix to main website's Dockerfile as previous commit.

 www.gimp.org/Dockerfile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/www.gimp.org/Dockerfile b/www.gimp.org/Dockerfile
index 9dea41ce..32a076af 100644
--- a/www.gimp.org/Dockerfile
+++ b/www.gimp.org/Dockerfile
@@ -1,4 +1,4 @@
-FROM centos:8
+FROM quay.io/centos/centos:stream8
 RUN dnf install -y python3-pip git make
 
 ARG branch=master