ARROW-17112: [Java] Fix a failure of TestArrowReaderWriter.testFileFooterSizeOverflow on s390x #13638
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TestArrowReaderWriter.testFileFooterSizeOverflowin arrow-vectors always causes a failure on s390x. This is because the test code stores footer length in platform native-endian buffer while footer length is stored as little-endian in a footer.This PR fixes only the test code.