fix(deps): add 'ethers@^6.7.1' dependency

[hylim-tech-lover]

closes #1295

What is being changed

Fix missing ethers dependency that utilized in each relevant modules.

Quality

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• I want these changes to be integrated
• I successfully ran pnpm i, pnpm build, pnpm test, pnpm test:browser locally.
• I allow my PR to be updated by the reviewers (to speed up the review process).
• I added unit tests.
• I added integration tests.
• I did not add automated tests because _________, and I am aware that a PR without tests will likely get rejected.

Details

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[hylim-tech-lover]

Ready for PR review.

Have used ethers: ^6.7.1 to standardize with @veramo/utils modules

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (572e08d) 85.47% compared to head (1efafcf) 85.47%.

Additional details and impacted files

@@           Coverage Diff           @@
##             next    #1304   +/-   ##
=======================================
  Coverage   85.47%   85.47%           
=======================================
  Files         170      170           
  Lines       18950    18950           
  Branches     2115     2115           
=======================================
  Hits        16197    16197           
  Misses       2753     2753           

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[mirceanis]

Looks great, thanks for spotting and fixing this!