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

Signed-off-by: dependabot[bot] <support@github.com>
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 <83691193+mukund-ananthu@users.noreply.github.com>