[at-spi2-core] Bump the BASE_TAG for container images, we are no longer in a branch

[Federico Mena Quintero <federico src gnome org>]

commit c5e82a296bf6222b3e49bc3221c9cda3ca05dacc
Author: Federico Mena Quintero <federico gnome org>
Date:   Tue May 31 17:19:10 2022 -0500

    Bump the BASE_TAG for container images, we are no longer in a branch

 ci/container_builds.yml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/ci/container_builds.yml b/ci/container_builds.yml
index 9194ba72..ac18cd5a 100644
--- a/ci/container_builds.yml
+++ b/ci/container_builds.yml
@@ -13,7 +13,7 @@ include:
 variables:
   # When branching change the suffix to avoid conflicts with images
   # from the master branch
-  BASE_TAG: "2022-05-24.0-prepare-for-merge"
+  BASE_TAG: "2022-05-31.0-master"
 
 .container.opensuse@x86_64:
   stage: "container-build"