fix: remove unneeded ERC20Upgradeable inheritance [N-17]

[pcarranzav]

No description provided.

[pcarranzav]

Broken test seems to be an instance of #576 - so retrying

[codecov]

Codecov Report

Merging #620 (1e171db) into pcv/571-n16-typos (012e3d2) will not change coverage.
The diff coverage is n/a.

@@                Coverage Diff                 @@
##           pcv/571-n16-typos     #620   +/-   ##
==================================================
  Coverage              91.91%   91.91%           
==================================================
  Files                     44       44           
  Lines                   2079     2079           
  Branches                 354      354           
==================================================
  Hits                    1911     1911           
  Misses                   168      168           

Flag	Coverage Δ
unittests	91.91% <ø> (ø)

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Impacted Files	Coverage Δ
contracts/l2/token/GraphTokenUpgradeable.sol	100.00% <ø> (ø)

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