buildlib: Use the right container for azure pipelines release mode

Switching to gcc10 needed the new container.

Fixes: 0136516 ("build/azp: Update to gcc-10")
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

buildlib/azure-pipelines-release.yml

@@ -11,7 +11,7 @@ trigger:
 resources:
   containers:
     - container: azp
-      image: ucfconsort.azurecr.io/rdma-core/azure_pipelines:25.0
+      image: ucfconsort.azurecr.io/rdma-core/azure_pipelines:29.0
       endpoint: ucfconsort_registry
 
 stages: