chore: Update changelog for v12.0.6 (#26595)

## **Description**

See diff for details

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## **Related issues**

N/A

## **Manual testing steps**

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## **Screenshots/Recordings**

N/A

## **Pre-merge author checklist**

- [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.

## **Pre-merge reviewer checklist**

- [x] 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.

Author: Gudahtt

CHANGELOG.md

@@ -7,6 +7,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ## [Unreleased]
 
 ## [12.0.6]
+### Changed
+- Improve error diagnostics ([#26482](https://github.com/MetaMask/metamask-extension/pull/26482))
+
+### Fixed
+- Fix errors in error diagnistics on Firefox ([#26467](https://github.com/MetaMask/metamask-extension/pull/26467))
+- Prevent pending transactions from causing excessive disk space usage ([#26485](https://github.com/MetaMask/metamask-extension/pull/26485))
+  - This is a repeat of the fix included in v12.0.1; it wasn't working for all users, but it should now.
+- Prevent UI crash while signature confirmation is closing ([#26248](https://github.com/MetaMask/metamask-extension/pull/26248))
 
 ## [12.0.5]
 ### Fixed