RFR: 8287378: GHA: Update cygwin to fix issues in langtools tests on Windows

[Christoph Langer]

On Thu, 26 May 2022 16:07:56 GMT, Christoph Langer <clanger at openjdk.org> wrote:

> This fixes the Windows GHA test failures that popped up short time ago, e.g. [these](https://github.com/RealCLanger/jdk/runs/6598399845)
> 
> Failing tests:
> tools/javac/Paths/MineField.sh
> tools/javac/Paths/wcMineField.sh
> 
> I've debugged it and it comes down to calls to javac/java in the test through env are failing with RC 127. E.g. here:
> https://github.com/openjdk/jdk/blob/e44465d4d6eaddebfc5a1b149223aa8332affa8b/test/langtools/tools/javac/Paths/MineField.sh#L218
> 
> Don't know why but I figured that the test failure goes away with current cygwin.
> 
> It should be ok to update cygwin now because the bug that made JDK-8276854 necessary seems to be fixed.

Thanks for the review.

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PR: https://git.openjdk.java.net/jdk/pull/8903