[Test Failure] deserializeStringrefExtension are failing on Windows

[robbavey]

After the commit of #17849, the Exhaustive Tests on all versions of Windows, across all branches that have the commit merged in have started failing with:

org.logstash.EventTest > deserializeStringrefExtensionEnabled FAILED
--
  | java.lang.IllegalArgumentException: string length not even: 1519
  | at java.base/java.util.HexFormat.parseNoDelimiter(HexFormat.java:835)
  | at java.base/java.util.HexFormat.parseHex(HexFormat.java:537)
  | at java.base/java.util.HexFormat.parseHex(HexFormat.java:505)
  | at org.logstash.EventTest.loadAnnotatedCBORFixture(EventTest.java:602)
  | at org.logstash.EventTest.deserializeStringrefExtensionEnabled(EventTest.java:152)

and

org.logstash.EventTest > deserializeStringrefExtensionDisabled FAILED
--
  | java.lang.NumberFormatException: not a hexadecimal digit: "#" = 35
  | at java.base/java.util.HexFormat.fromHexDigit(HexFormat.java:895)
  | at java.base/java.util.HexFormat.fromHexDigits(HexFormat.java:912)
  | at java.base/java.util.HexFormat.parseNoDelimiter(HexFormat.java:839)
  | at java.base/java.util.HexFormat.parseHex(HexFormat.java:537)
  | at java.base/java.util.HexFormat.parseHex(HexFormat.java:505)
  | at org.logstash.EventTest.loadAnnotatedCBORFixture(EventTest.java:602)
  | at org.logstash.EventTest.deserializeStringrefExtensionDisabled(EventTest.java:161)

[yaauie]

It looks like it's failing to load the test fixture (which is lower ASCII) using UTF8. I'll find a way to get it to read, but it may take a few iterations as I don't have a Windows dev environment. I plan to push to a temp branch and kick off these exhaustive tests while I iterate.