fix(deps): update dependency @ethersproject/transactions to ^5.8.0

[metamask-ci]

This PR contains the following updates:

Package	Change	Age	Confidence
@ethersproject/transactions (source)	^5.7.0 → ^5.8.0

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Note

Low Risk
Lockfile and manifest-only semver bump with no logic changes; minor ethers v5 maintenance aligned with related dependency updates.

Overview
Updates @metamask/smart-transactions-controller to depend on @ethersproject/transactions ^5.8.0 (from ^5.7.0), with matching yarn.lock and an [Unreleased] changelog entry.

This is a dependency-only change; no application source is modified. The package already uses this library (e.g. parse in utils.ts) alongside other @ethersproject/* packages already bumped to 5.8.0.

^{Reviewed by Cursor Bugbot for commit f2f8179. Bugbot is set up for automated code reviews on this repo. Configure here.}

[metamask-ci]

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