chore: bump Prettier to ^3.3.3 + interop deps

[cryptodev-2s]

Explanation

Aligns Prettier-related dev tooling with the versions used by MetaMask/core, in preparation for migration. Unblocks subsequent bumps of @metamask/messenger-cli, @metamask/auto-changelog, and @metamask/eslint-config* which all peer-require Prettier 3.

Bumps

• prettier ^2.8.8 → ^3.3.3
• eslint-plugin-prettier ^4.2.1 → ^5.2.1
• eslint-config-prettier ^8.8.0 → ^9.1.0

Notes

• No source-code reformat was needed — running prettier --write . on the codebase produced no diffs. Existing files were already Prettier-3-compatible.
• Lint and full test suite (196/196) remain green.

References

• Migration plan: PR-A of the Phase A package alignment sequence (PR-B follows: ESLint v15 flat-config + auto-changelog v6 + messenger-cli v0.2 bundle)

---

Note

Low Risk
Dev-only dependency and lockfile updates; no runtime or published package API changes.

Overview
Bumps Prettier 3 and matching ESLint integration packages in devDependencies only (package.json + yarn.lock): prettier ^2.8.8 → ^3.3.3, eslint-plugin-prettier ^4.2.1 → ^5.2.1, and eslint-config-prettier ^8.8.0 → ^9.1.0. The lockfile picks up related transitive updates (e.g. eslint-plugin-prettier now depends on synckit ^0.11.13 and @pkgr/core).

This aligns formatting/lint tooling with MetaMask/core and clears peer dependency requirements for a later Phase A bump of @metamask/messenger-cli, @metamask/auto-changelog, and @metamask/eslint-config*. No application or library source files change in this diff.

^{Reviewed by Cursor Bugbot for commit bd3730a. Bugbot is set up for automated code reviews on this repo. Configure here.}

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	eslint-config-prettier@​8.8.0 ⏵ 9.1.2	+1		+1
	eslint-plugin-prettier@​4.2.1 ⏵ 5.5.6	+1
	prettier@​3.8.4

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