Pin emicklei/go-restful to v3.9.0

[brandond]

Proposed Changes

Fix regression in legacy API prefix, until upstream pulls in support for MergePathStrategy from emicklei/go-restful#523

Types of Changes

bugfix

Verification

See linked issue

Testing

kubectl get --raw /api/

Linked Issues

• [release-1.27] path normalization affecting kubectl proxy conformance test for /api endpoint #7599

User-Facing Change

NONE

Further Comments

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.02 🎉

Comparison is base (91c5e0d) 47.51% compared to head (8f55b17) 47.54%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7597      +/-   ##
==========================================
+ Coverage   47.51%   47.54%   +0.02%     
==========================================
  Files         140      140              
  Lines       14284    14284              
==========================================
+ Hits         6787     6791       +4     
+ Misses       6415     6413       -2     
+ Partials     1082     1080       -2     

Flag	Coverage Δ
inttests	44.89% <ø> (+0.02%)	⬆️
unittests	19.83% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

see 7 files with indirect coverage changes

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