fix(deps): gridplus-sdk@2.5.1->~2.6.0 (#27973)

- fix(deps): `gridplus-sdk@2.5.1->~2.6.0`
    - `2.7.0` updates to `@ethereumjs/tx` 5, so holding at 2.6
    - removes dependency on legacy `ethereum-cryptography` v1
- dedupe and unpin `@ethereumjs/tx` to `^4.2.0`
  - `eth-lattice-keyring` is pinned to `@ethereumjs/tx@4.1.1`
  - `gridplus-sdk` is pinned to `@ethereumjs/tx@4.1.2`
- fix(deps): bump `elliptic@6.5.4->^6.5.7` via resolutions
- fix(deps): bump `secp256k`

[![Open in GitHub
Codespaces](https://github.com/codespaces/badge.svg)](https://codespaces.new/MetaMask/metamask-extension/pull/27973?quickstart=1)

- GridPlus/eth-lattice-keyring#64
- GridPlus/gridplus-sdk#547

- [x] I've followed [MetaMask Contributor
Docs](https://github.com/MetaMask/contributor-docs) and [MetaMask
Extension Coding
Standards](https://github.com/MetaMask/metamask-extension/blob/develop/.github/guidelines/CODING_GUIDELINES.md).
- [x] I've completed the PR template to the best of my ability
- [x] I’ve included tests if applicable
- [x] I’ve documented my code using [JSDoc](https://jsdoc.app/) format
if applicable
- [x] I’ve applied the right labels on the PR (see [labeling
guidelines](https://github.com/MetaMask/metamask-extension/blob/develop/.github/guidelines/LABELING_GUIDELINES.md)).
Not required for external contributors.

- [ ] I've manually tested the PR (e.g. pull and build branch, run the
app, test code being changed).
- [ ] I confirm that this PR addresses all acceptance criteria described
in the ticket it closes and includes the necessary testing evidence such
as recordings and or screenshots.