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Version 2.48.10
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Update dependent crates that had security vulnerabilities:

  futures-util to 0.3.14  - RUSTSEC-2020-0059
  futures-task to 0.3.14  - RUSTSEC-2020-0060
  generic-array to 0.13.3 - RUSTSEC-2020-0146  
  smallvec to 1.6.1       - RUSTSEC-2021-0030

There are no changes to the library code.