fix(rgaa): adjust mapping of aria-hidden-* and valid-lang (#4935)

Map `aria-hidden-body` and `aria-hidden-focus` to RGAA test 10.8.1 and
`valid-lang` to RGAA 8.8.1

Closes: #4926

---------

Co-authored-by: Steven Lambert <[email protected]>

Author: WilcoFiers

lib/rules/aria-hidden-body.json

@@ -13,7 +13,7 @@
     "EN-9.1.3.1",
     "EN-9.4.1.2",
     "RGAAv4",
-    "RGAA-7.1.1"
+    "RGAA-10.8.1"
   ],
   "metadata": {
     "description": "Ensure aria-hidden=\"true\" is not present on the document body.",

lib/rules/aria-hidden-focus.json

@@ -13,7 +13,7 @@
     "EN-301-549",
     "EN-9.4.1.2",
     "RGAAv4",
-    "RGAA-7.1.1"
+    "RGAA-10.8.1"
   ],
   "actIds": ["6cfa84"],
   "metadata": {

lib/rules/valid-lang.json

@@ -12,7 +12,7 @@
     "EN-9.3.1.2",
     "ACT",
     "RGAAv4",
-    "RGAA-8.7.1"
+    "RGAA-8.8.1"
   ],
   "actIds": ["de46e4"],
   "metadata": {