[Merged by Bors] - Simplify VRFSigner() method to not return an error

[poszu]

Cleanup VRFSigner() method to not return a redundant error.

[poszu]

bors merge

[codecov]

Codecov Report

Merging #5147 (15ada47) into develop (8331ded) will increase coverage by 0.0%.
Report is 3 commits behind head on develop.
The diff coverage is 100.0%.

@@           Coverage Diff           @@
##           develop   #5147   +/-   ##
=======================================
  Coverage     77.5%   77.5%           
=======================================
  Files          258     258           
  Lines        30439   30427   -12     
=======================================
- Hits         23591   23582    -9     
  Misses        5336    5336           
+ Partials      1512    1509    -3     

Files	Coverage Δ
beacon/beacon.go	79.2% <100.0%> (-0.1%)	⬇️
hare3/legacy_oracle.go	81.0% <100.0%> (+3.5%)	⬆️
miner/proposal_builder.go	93.6% <100.0%> (ø)
node/node.go	63.6% <100.0%> (+0.1%)	⬆️
signing/signer.go	70.0% <100.0%> (+0.5%)	⬆️

... and 3 files with indirect coverage changes

[bors]

Pull request successfully merged into develop.

Build succeeded!

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