chore: bump solc version to 0.8.23

[fedealconada]

No description provided.

[github-actions]

Slither report

THIS CHECKLIST IS NOT COMPLETE. Use --show-ignored-findings to show all the results.
Summary

• solc-version (1 results) (Informational)

solc-version

Impact: Informational
Confidence: High

• ID-0
  solc-0.8.23 is not recommended for deployment

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (03ee289) 73.72% compared to head (cdcbb51) 73.72%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #31   +/-   ##
=======================================
  Coverage   73.72%   73.72%           
=======================================
  Files          10       10           
  Lines         411      411           
  Branches      113      113           
=======================================
  Hits          303      303           
  Misses         48       48           
  Partials       60       60           

Files	Coverage Δ
src/ETHPriceIsRight.sol	71.42% <ø> (ø)
src/Faucet.sol	64.28% <ø> (ø)
src/KintoID.sol	81.73% <ø> (ø)
src/libraries/ByteSignature.sol	0.00% <ø> (ø)
src/paymasters/SponsorPaymaster.sol	73.91% <ø> (ø)
src/sample/Counter.sol	100.00% <ø> (ø)
src/tokens/EngenCredits.sol	84.00% <ø> (ø)
src/viewers/KYCViewer.sol	75.00% <ø> (ø)
src/wallet/KintoWallet.sol	72.17% <ø> (ø)
src/wallet/KintoWalletFactory.sol	73.91% <ø> (ø)