feat: upgrade mdc-web packages to v13

Author: hperrin

MIGRATING.md

@@ -2,6 +2,11 @@
 
 This doc contains information that will help you migrate your code from an older version of SMUI to a newer one. Things that you will need to change in your existing code will be written here. It would also be helpful to check the MDC changelog if the upstream MDC versions has changed between SMUI versions.
 
+# SMUI 5 -> SMUI 6
+
+SMUI 6 migrated to upstream MDC 13.0 from 11.0:
+https://github.com/material-components/material-components-web/blob/master/CHANGELOG.md#1300-2021-09-24
+
 # SMUI 4 -> SMUI 5
 
 ## Breaking Changes