chore: remove refs to deprecated io/ioutil

[testwill]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.04 ⚠️

Comparison is base (cec32d6) 81.64% compared to head (b2bf067) 81.60%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1038      +/-   ##
==========================================
- Coverage   81.64%   81.60%   -0.04%     
==========================================
  Files         135      135              
  Lines       15104    15104              
==========================================
- Hits        12331    12325       -6     
- Misses       2218     2222       +4     
- Partials      555      557       +2     

Impacted Files	Coverage Δ
pkg/filters/kafkabackend/kafka.go	80.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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