chore(deps): update oci.element.io/element-admin docker tag to v0.1.8

roles/custom/matrix-element-admin/defaults/main.yml

@@ -11,7 +11,7 @@
 matrix_element_admin_enabled: true
 
 # renovate: datasource=docker depName=oci.element.io/element-admin
-matrix_element_admin_version: 0.1.7
+matrix_element_admin_version: 0.1.8
 
 matrix_element_admin_scheme: https