更新依赖中七牛 sdk 版本

解决 mime-types 版本过低问题, 见 <https://github.com/qiniu/ruby-sdk/commit/0bca27457af377f52f057bcd9feee151a1d95fd0>  <https://github.com/qiniu/ruby-sdk/commit/5332645665c398d3bdffc810e2e8ea2307b68fb9>