Solc updated to 0.8.20 (ETH-1254)

[iamsahu]

Description

The solidity version of the current contracts is set to 0.8.10. Currently the latest version of solidity is 0.8.23.
There are numerous fixes and enhancements that have been shipped till now to the solc. As a best practice it is suggested to use as latest as possible solc. This PR updates the solc version to 0.8.20.

Notice

• Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• Have you assigned this PR to yourself?
• Have you added at least 1 reviewer?
• Have you updated the official documentation?
• Have you added sufficient documentation in your code?
• Have you added relevant tests to the official test suite?

Pull Request Type

• 💫 New Feature (Breaking Change)
• 💫 New Feature (Non-breaking Change)
• 🛠️ Bug fix (Non-breaking Change: Fixes an issue)
• 🕹️ Chore (Non-breaking Change: Doc updates, pkg upgrades, typos, etc..)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6c762b0) 95.27% compared to head (25a58c2) 95.27%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #246   +/-   ##
=======================================
  Coverage   95.27%   95.27%           
=======================================
  Files          72       72           
  Lines        1694     1694           
  Branches      229      229           
=======================================
  Hits         1614     1614           
  Misses         26       26           
  Partials       54       54           

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[mischat]

This looks good to me, i found a single file that hadn't been updated, but i pushed a fix for that.

I also like how the natspecs are now better after this compiler update.

[cebidhem]

LGTM 🚀