Fix prometheus node exporter kolla image build

This change updates the node exporter sha256 hash to match the newer
(pinned) version we are using. This was not required in the yoga cycle
as the hash was not checked.

Author: Alex-Welsh

etc/kayobe/kolla.yml

@@ -336,6 +336,7 @@ kolla_build_args:
   memcached_exporter_version: "0.9.0"
   mysqld_exporter_version: "0.13.0"
   node_exporter_version: "1.5.0"
+  node_exporter_sha256sum: "af999fd31ab54ed3a34b9f0b10c28e9acee9ef5ac5a5d5edfdde85437db7acbb"
   prometheus_version: "2.35.0"
   prometheus_alertmanager_version: "0.24.0"