make code compile under Go v1.20

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[codecov-commenter]

Codecov Report

Base: 73.11% // Head: 73.11% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (9741878) compared to base (7c2c484).
Patch has no changes to coverable lines.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #922      +/-   ##
==========================================
- Coverage   73.11%   73.11%   -0.01%     
==========================================
  Files         130      130              
  Lines       14969    14969              
==========================================
- Hits        10945    10944       -1     
- Misses       3404     3407       +3     
+ Partials      620      618       -2     

Impacted Files	Coverage Δ
pkg/object/httpserver/runtime.go	68.50% <ø> (ø)
pkg/object/grpcserver/runtime.go	67.91% <0.00%> (-6.42%)	⬇️
pkg/filters/headerlookup/headerlookup.go	84.61% <0.00%> (-1.40%)	⬇️
pkg/filters/validator/basicauth.go	75.38% <0.00%> (+0.38%)	⬆️
pkg/cluster/cluster.go	62.21% <0.00%> (+2.10%)	⬆️

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