build(deps): bump cryptography from 41.0.6 to 42.0.0 in /.kokoro (#1070)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>
Co-authored-by: mukund-ananthu <[email protected]>