v7.2.1

What's fixed

• Fixed error when querying customers stored as database users #1082 #1088 by @duncanmcclean
• Fixed error when saving user customer data #1083 #1087 by @duncanmcclean
• Fixed {{ sc:customer:order }} tag #1081 #1086 by @duncanmcclean
• Prevented preload method from being called when augmenting product variants #1076 #1085 by @duncanmcclean
• Fixed broken link to the Statamic 5 upgrade guide in the docs #1080 by @Afan417