all: use min/max/clear from go1.21

[ucwong]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 47.24%. Comparing base (ed0fa5a) to head (ad45a3c).
Report is 28 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1946      +/-   ##
==========================================
+ Coverage   47.23%   47.24%   +0.01%     
==========================================
  Files         568      568              
  Lines       68859    68845      -14     
==========================================
+ Hits        32524    32529       +5     
+ Misses      33804    33792      -12     
+ Partials     2531     2524       -7     

Files	Coverage Δ
accounts/keystore/keystore.go	64.19% <100.00%> (-0.16%)	⬇️
crypto/crypto.go	65.28% <100.00%> (-0.29%)	⬇️
crypto/secp256k1/scalar_mult_cgo.go	78.94% <100.00%> (-2.01%)	⬇️
ctxc/peer.go	36.11% <ø> (-1.73%)	⬇️
p2p/discover/common.go	85.71% <ø> (+7.93%)	⬆️
p2p/discover/v5wire/crypto.go	69.76% <100.00%> (-0.35%)	⬇️
rlp/decode.go	90.06% <100.00%> (-0.02%)	⬇️

... and 13 files with indirect coverage changes