fix: correct typo in AutoscalerReference type name

[kahirokunn]

• Fix spelling of AutoscalerReference (was AutoscalerRefernce) in type definition and struct field

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 39.30%. Comparing base (febc327) to head (f514912).
Report is 10 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/apis/flagger/v1beta1/zz_generated.deepcopy.go	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1739      +/-   ##
==========================================
+ Coverage   39.27%   39.30%   +0.03%     
==========================================
  Files         284      284              
  Lines       22379    22391      +12     
==========================================
+ Hits         8789     8801      +12     
  Misses      12643    12643              
  Partials      947      947              

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