Bump stackhpc-image-elements pin for build fixes

Author: Alex-Welsh

etc/kayobe/overcloud-dib.yml

@@ -67,7 +67,7 @@ overcloud_dib_host_packages_extra:
 overcloud_dib_git_elements_extra:
   - repo: "https://github.com/stackhpc/stackhpc-image-elements"
     local: "{{ source_checkout_path }}/stackhpc-image-elements"
-    version: "v1.6.1"
+    version: "v1.6.3"
     elements_path: "elements"
 
 # List of git repositories containing Diskimage Builder (DIB) elements. See