Update reason why variance test is disabled

Author: kg

src/tests/issues.targets

@@ -1755,6 +1755,9 @@
         <ExcludeList Include="$(XunitTestBinBase)/Regressions/coreclr/16123/ambiguousconstraint/**">
             <Issue>needs triage</Issue>
         </ExcludeList>
+        <ExcludeList Include="$(XunitTestBinBase)/Regressions/coreclr/16355/variance/**">
+            <Issue>ldtoken in default interface methods does not appear to work in minijit or interp</Issue>
+        </ExcludeList>
         <ExcludeList Include="$(XunitTestBinBase)/Regressions/coreclr/20616/UnicodeBug/**">
             <Issue>needs triage</Issue>
         </ExcludeList>