feat: update Permit Signature Redesign "Spending cap" copy (#25618)

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## **Description**

Updates Permit signature redesign copy "Approve spend limit" → "Spending
cap"

[![Open in GitHub
Codespaces](https://github.com/codespaces/badge.svg)](https://codespaces.new/MetaMask/metamask-extension/pull/25618?quickstart=1)

## **Related issues**

Fixes: MetaMask/MetaMask-planning#2719

## **Manual testing steps**

1. Go to test dapp
2. Click on Malicious Permit within the ppom section

## **Screenshots/Recordings**

<!-- If applicable, add screenshots and/or recordings to visualize the
before and after of your change. -->

### **Before**

<img width="320"
src="https://github.com/MetaMask/metamask-extension/assets/20778143/c63c615e-4ae3-4cc2-a74d-fe00c9416ece">

### **After**

<img width="320"
src="https://github.com/MetaMask/metamask-extension/assets/20778143/00fc3099-25f9-46ff-bc85-f93b8e36ae86">

## **Pre-merge author checklist**

- [ ] 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).
- [ ] I've completed the PR template to the best of my ability
- [ ] I’ve included tests if applicable
- [ ] I’ve documented my code using [JSDoc](https://jsdoc.app/) format
if applicable
- [ ] 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.

## **Pre-merge reviewer checklist**

- [ ] 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.

ui/pages/confirmations/components/confirm/info/typed-sign/permit-simulation/__snapshots__/permit-simulation.test.tsx.snap

@@ -54,7 +54,7 @@ exports[`PermitSimulation renders component correctly 1`] = `
         <p
           class="mm-box mm-text mm-text--body-md-medium mm-box--color-inherit"
         >
-          Approve spend limit
+          Spending cap
         </p>
       </div>
       <div

ui/pages/confirmations/components/confirm/info/typed-sign/permit-simulation/permit-simulation.tsx

@@ -54,7 +54,7 @@ const PermitSimulation: React.FC<{
       >
         <ConfirmInfoRowText text={t('permitSimulationDetailInfo')} />
       </ConfirmInfoRow>
-      <ConfirmInfoRow label={t('approve')}>
+      <ConfirmInfoRow label={t('spendingCap')}>
         <Box style={{ marginLeft: 'auto' }}>
           <Box display={Display.Flex}>
             <Box display={Display.Inline} marginInlineEnd={1}>