[librsvg-oci-images] Revert "Update fedora/latest to fedora:31"

[Jordan Petridis <jpetridis src gnome org>]

commit 389c61490b72c813914cc154c7cf3e70f568e5c0
Author: Jordan Petridis <jpetridis gnome org>
Date:   Tue Aug 27 13:17:50 2019 +0300

    Revert "Update fedora/latest to fedora:31"
    
    This reverts commit 0e405c09204ecd9fd6d04d2611b8b7de062e4429.
    
    The published oci image is still rawhide and hasn't been updated
    to the branched f31 version yet

 fedora/latest | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/fedora/latest b/fedora/latest
index 409f0c2..9b0d9dd 100644
--- a/fedora/latest
+++ b/fedora/latest
@@ -1,4 +1,4 @@
-FROM registry.fedoraproject.org/fedora:31
+FROM registry.fedoraproject.org/fedora:30
 
 COPY prepare.sh cleanup.sh /root/