SpringBoot Avoid illegal reflective access on ZipEntry.xdostime

Hi,

this PR provides an alternative solution for the illegal reflective access on ZipEntry.xdostime inside JarFileTests.jarFileEntryWithEpochTimeOfZeroShouldNotFail and is part of the overall JDK 17 story at #26767.

As per comment from @AlanBateman I took another look and found that the JDK is testing things a bit differently for similar scenarios that doesn't require reflection or opening up modules. See ZeroDate.java

The idea is basically to change the necessary bytes in the actual file. Also not too pretty, I must say. But it's reflection free and doesn't access any internals anymore.

Let me know what you think. Cheers, Christoph

Comment From: wilkinsona

Thanks very much, @dreis2211.