prefer slices.SortFunc to sort.Sort

[gammazero]

In many situations, the newer slices.SortFunc function is more ergonomic and runs faster than sort.Sort. Using slices.SortFunc also avoids having to define custom slice types to make slices of objects sortable.

[codecov]

Codecov Report

Attention: Patch coverage is 71.87500% with 9 lines in your changes missing coverage. Please review.

Project coverage is 60.53%. Comparing base (de52bc8) to head (e5abaff).

Files with missing lines	Patch %	Lines
filestore/util.go	0.00%	8 Missing ⚠️
routing/http/client/client.go	50.00%	1 Missing ⚠️

@@            Coverage Diff             @@
##             main     #796      +/-   ##
==========================================
+ Coverage   60.52%   60.53%   +0.01%     
==========================================
  Files         245      245              
  Lines       31130    31124       -6     
==========================================
+ Hits        18841    18842       +1     
+ Misses      10613    10609       -4     
+ Partials     1676     1673       -3     

Files with missing lines	Coverage Δ
bitswap/client/wantlist/wantlist.go	90.47% <100.00%> (-0.15%)	⬇️
bitswap/server/server.go	56.57% <100.00%> (+1.19%)	⬆️
gateway/headers.go	100.00% <100.00%> (ø)
ipld/merkledag/coding.go	78.03% <100.00%> (-0.33%)	⬇️
ipld/merkledag/node.go	84.48% <100.00%> (+0.05%)	⬆️
ipns/record.go	68.21% <100.00%> (ø)
routing/http/client/client.go	70.83% <50.00%> (ø)
filestore/util.go	0.00% <0.00%> (ø)

... and 12 files with indirect coverage changes