Update Educates version.

Author: GrahamDumpleton

workshops/lab-authoring-environment/resources/workshop.yaml

@@ -19,7 +19,7 @@ spec:
     - name: educates
       files:
       - image:
-          url: $(oci_image_cache)/educates-client-programs:3.0.0-alpha.17
+          url: $(oci_image_cache)/educates-client-programs:3.0.0-alpha.18
         path: bin
         includePaths:
         - educates-linux-$(platform_arch)