chore: bump golangci-lint to v1.52

[tri-adam]

Bump golangci-lint to v1.52. Replace individual nolint lines with errorf-multi: false in global CI config (#265). Re-enable unused linter (closes #269).

[codecov-commenter]

Codecov Report

Merging #274 (da4fe3e) into main (20e4326) will increase coverage by 0.04%.
The diff coverage is 80.00%.

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@@            Coverage Diff             @@
##             main     #274      +/-   ##
==========================================
+ Coverage   72.88%   72.93%   +0.04%     
==========================================
  Files          35       35              
  Lines        2914     2908       -6     
==========================================
- Hits         2124     2121       -3     
+ Misses        636      634       -2     
+ Partials      154      153       -1     

Impacted Files	Coverage Δ
pkg/integrity/digest.go	91.42% <ø> (-0.24%)	⬇️
pkg/integrity/dsse.go	72.07% <0.00%> (-0.25%)	⬇️
pkg/integrity/clearsign.go	83.63% <100.00%> (ø)
pkg/sif/create.go	73.48% <100.00%> (+0.55%)	⬆️
pkg/siftool/siftool.go	92.50% <100.00%> (ø)

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