chore: upgrade @ethers to 6 in @farcaster/hubble

[varunsrin]

Motivation

Ethers 6 is smaller, uses audited crypto libraries (noble), more null-safe and is all ES modules making easier to use in modern JS toolchains. More details here.

Change Summary

Upgrade all use of ethers 5 to 6

Merge Checklist

• The title of this PR adheres to the conventional commits standard
• The PR has been tagged with the appropriate change type label(s) (i.e. documentation, feature, bugfix, or chore)

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[socket-security]

Socket Security Pull Request Report

Dependency issues detected. If you merge this pull request, you will not be alerted to the instances of these issues again.

📜 Install scripts

Install scripts are run when the package is installed. The majority of malware in npm is hidden in install scripts.

Packages should not be running non-essential scripts during install and there are often solutions to problems people solve with install scripts that can be run at publish time instead.

Package	Script field	Source
turbo@1.7.3 (added)	postinstall	package.json

Pull request report summary

Issue	Status
Install scripts	⚠️ 1 issue
Native code	✅ 0 issues
Bin script confusion	✅ 0 issues
Bin script shell injection	✅ 0 issues
Unresolved require	✅ 0 issues
Invalid package.json	✅ 0 issues
HTTP dependency	✅ 0 issues
Git dependency	✅ 0 issues
Potential typo squat	✅ 0 issues
Known Malware	✅ 0 issues
Telemetry	✅ 0 issues
Protestware/Troll package	✅ 0 issues

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[varunsrin]

closing in favor of #670