fix: update multipart 3.1.0

[atian25]

Checklist

• npm test passes
• tests and/or benchmarks are included
• documentation is changed or added
• commit message follows commit guidelines

Affected core subsystem(s)

Description of change

eggjs/egg-multipart#56
#5032

[codecov]

Codecov Report

Base: 99.68% // Head: 99.68% // No change to project coverage 👍

Coverage data is based on head (ca63254) compared to base (694142a).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5034   +/-   ##
=======================================
  Coverage   99.68%   99.68%           
=======================================
  Files          35       35           
  Lines        3532     3532           
  Branches      523      523           
=======================================
  Hits         3521     3521           
  Misses         11       11           

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