Main issue detailing the ARIA/core-aam change for role="sectionheader" and role="sectionfooter" : w3c/aria#1931.

It looks like html-aam WPTs were also written for these new roles to test that they act as implicit roles for <header>/<footer> (https://github.com/web-platform-tests/wpt/blob/f3be5f1e7435ecf568f0e778b63eb240df93fd60/html-aam/roles-contextual.tentative.html) however, this also needs needs to be updated in html-aam as they are currently mapped as generic:

• <header>: https://w3c.github.io/html-aam/#el-header
• <footer>: https://w3c.github.io/html-aam/#el-footer