Fix up deprecation version for ED25519_SIGNATURE_SIZE

[mzabaluev]

0.23.1 was released before #1023 or its backport to v0.23.x (#1031) were merged.

[codecov-commenter]

Codecov Report

Merging #1032 (6d38fee) into master (df231ed) will increase coverage by 0.0%.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #1032   +/-   ##
======================================
  Coverage    66.1%   66.1%           
======================================
  Files         209     209           
  Lines       20760   20760           
======================================
+ Hits        13724   13726    +2     
+ Misses       7036    7034    -2     

Impacted Files	Coverage Δ
tendermint/src/signature.rs	55.0% <ø> (ø)
light-client/src/types.rs	38.3% <0.0%> (ø)
tendermint/src/node.rs	63.7% <0.0%> (+0.1%)	⬆️
testgen/src/validator.rs	87.5% <0.0%> (+0.7%)	⬆️

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