PEP 825: add "static data" to problems deferred to the next PEP

Given it came up more than once already, I suppose it makes sense to
point it out explicitly, even though it technically falls under
"compatibility".

Signed-off-by: Michał Górny <mgorny@quansight.com>

Author: mgorny

peps/pep-0825.rst

@@ -1068,6 +1068,7 @@ The following problems are deferred to subsequent PEPs in the series:
 
 - governance of variant namespaces
 - determining which variant properties are compatible with the system
+- overriding the compatibility detection using static data
 - building variant wheels
 
 In addition to that, the following matters are left