Update ticket reference for disabled tests on x86.
    
    Tests fail with a LANG=C environment. A new investigation into the
    failing tests on x86 revealed exact commits which introduced the issue
    and the commits that fixed the situation. Fix is not yet present in Ruby
    3.2, therefore the conditional disabling the tests was left in.
    A new re-reported ticket replaced the old one. The new upstream ticket
    includes better detailed description of the environment causing the
    issue.
    
    The tests pass in Rawhide mock (F40), as the LANG there is C.UTF-8
    that does not suffer from the issue.
    
    Upstream ticket: https://bugs.ruby-lang.org/issues/20045