Minor improvements to Upgrades package

[immrsd]

PR Checklist

• Tests
• Documentation
• Added entry to CHANGELOG.md
• Tried the feature on a public network

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.06%. Comparing base (20d5d92) to head (7fa96de).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1225   +/-   ##
=======================================
  Coverage   92.06%   92.06%           
=======================================
  Files          49       49           
  Lines        1399     1399           
=======================================
  Hits         1288     1288           
  Misses        111      111           

Files with missing lines	Coverage Δ
packages/upgrades/src/upgradeable.cairo	100.00% <100.00%> (ø)

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[ericnordelo]

LGTM!

[andrew-fleming]

LGTM!