test escape apos

[ahorek]

a test for https://bugs.ruby-lang.org/issues/16922

but after tables update from the ruby 3.0 repo, I'm getting errors

Last Error  => xml_attr_quote
  result: InvalidByteSequence
  error bytes: f
  read again length: 0

jcodings/test/org/jcodings/specific/TestEConv.java

Line 67 in f6f148e

public void testXMLWithCharref() throws Exception {

@lopex do you have any idea what should be changed?